This document discusses Microchip PIC microcontrollers and their use in an electrocardiogram (ECG) device. It covers the internal architecture of PIC microcontrollers including memory organization, registers, oscillators, and analog-to-digital converters. Diagrams and examples are provided to explain how PIC microcontrollers function and can be programmed to acquire, process, and transmit ECG signal data.

1. Page 1
Universidad de Huánuco
Facultad de Ingeniería de Sistemas e Informática

2. Page 2
Agenda
•Base del Conocimiento
–Diagramas de Bode
–Diseño de Filtros Analógicos
–Diseño de un Electrocardiograma
–Microcontrolador PIC con Labview
•Motor de Inferencia
–Técnicas de Diagnóstico de un ECG
•Medios de Comunicación
–Prototipo de un ECG

3. Page 3
Acerca del ECG-UDH

4. Page 4
Modelando un PIC
PIC
Procesador
Memoria
Temporizador
ADC
USB
GLCD
Oscilador

5. Page 5
Modelando un PIC
Input Variables Output (User Interface) Variables (Link to other Systems) Embedded Computer Software Hardware Signal Conditioning Data Conversion Output Drive (display, keypad etc.)

6. Page 6
Microcontrolador PIC
•Como sabemos los micro controladores de 8 bits de Microchip se dividen en 3 gamas:
–PIC10 y PIC12: Gama baja
–PIC16: Gama media
–PIC18: Gama alta

7. Page 7
Estructura Interna de un PIC

8. Page 8
Estructura Externa de un PIC

9. Page 9
Organización de las Memorias de un PIC
a) Enfoque de Von Neumann b) Enfoque de Harvard
Data
Memory
Program
Memory
Address
Data
Central
Processing
Unit (CPU)
Input/
Output
Central
Processing
Unit (CPU)
Data
Memory
Input/
Output
Program
Memory
Address
Data
Address
Data
Address
Data

10. Page 10
Arquitectura RISC-PIC
A CISC machine is generally
recognised by:
• Many instructions (say over one
hundred), some with considerable
sophistication;
• Instruction words are of different
length;
• Instructions take different
lengths of time to execute.
A RISC machine is generally
recognised by:
• Few instructions (say well below
one hundred),
• Each performs a very simple
action;
• All instructions are single word;
• All, or almost all instructions
take the same length of time to
execute.
Digital
Program
I/0
Microprocessor
Data
Memory
Memory
Core
Analog
I/0
& Timers
Counters
Reset
Power
Clock
Address Buses
Internal Data &
Further
Peripheral
Further
Peripheral
Interrupt(s)
A microcontroller = microprocessor core + memory + peripherals

11. Page 11
Diagrama de Bloques del PIC
The CPU
Address for Program Memory
Data from Program Memory, carrying instruction word
Address for Data Memory
Data bus for Data Memory and peripherals
Program Memory
Data Memory
Extra “non- volatile” Data Memory
Counter/Timer Peripheral
Digital Input/ Output Ports
It is easy to see the Program memory, which uses Flash memory technology. Alongside this comes the Stack, which we meet later. Microchip call the main data memory “File Registers”. There is another section of data memory which uses EEPROM technology.

12. Page 12
Registro de Estado de un PIC
Condition Code Flags

13. Page 13
Memoria de Programa y Stack
Program Counter
16 Series instructions which invoke the Stack
Unimplemented memory space, still addressable by the 13-bit 16F84A program address bus.
Program Counter points to locations in program memory
The program must start here
The Interrupt Service Routine must start here

14. Page 14
Mapa de Memoria de Datos y (SFR) Registro de Funciones Especiales
msb is “bank select bit”
(Status register).
These are the Special Function Registers, which allow the CPU to interact with the peripherals
General purpose memory

15. Page 15
Interface con Periféricos vía el
Registro de Funciones Especiales
Control SFR(s)
Peripheral
Data Transfer SFR(s)
Microcontroller
Core
"Outside
World"
Interrupt(s)
Microcontroller Interaction with its Peripherals, via Special Function Register (SFR) and Interrupt
 microcontroller peripherals can be configured in software to operate in a number of different modes,
to do this certain control data must be sent to them to set them up in the desired way
 once in use, there will be data flow between core and peripheral,
 there may still be need for further control data,
 these needs are commonly met by means of dedicated, memory - mapped registers, sometimes
called Special Function Registers,
 this approach gives the microcontroller manufacturer great flexibility to extend a microcontroller
family – SFRs for new peripherals can easily be located in gaps in the memory map.

16. Page 16
Configuraciones Globales del PIC
The configuration word determines certain operating features of the microcontroller. It is in program memory, but cannot be accessed in normal operation. It is written to during the programming process. You set its value either by response to a dialogue box in MPLAB, or by use of Assembler Directives, at the head of your programme.
The 16F84A Configuration Word

17. Page 17
Tipos de Memorias de un PIC

18. Page 18
Características de los Osciladores
Oscilador Primario
Oscilador Secundario
Oscilador Interno
Frecuencias de Oscilación Altas (XT, HS)
Frecuencias de Oscilación Medias (LP)
Frecuencias de Oscilación Bajas (RC)
Con PLL
Sin PLL
Con Pre Escala
Sin Pre Escala
Con Pre Escala
Sin Pre Escala
Multiplica Frecuencia de Oscilación
Divide Frecuencia de Oscilación
Divide Frecuencia de Oscilación

19. Page 19
Modos del Oscilador
The 16F84A can be configured to operate in four different oscillator modes, using R-C, crystal or ceramic oscillators. It can also accept an external clock source. The user selects which mode is to be used by setting bits in the Configuration Word.
XT – Crystal
The standard crystal configuration, intended for crystals or ceramics in the range 1MHz to 4MHz.
HS – High Speed
A higher drive version of the XT configuration, for higher frequency crystals and ceramic resonators. Intended for frequencies in the region of 4MHz or greater. It leads to the highest current consumption of all the oscillator modes.
LP – Low Power
Intended for low frequency crystal applications, and gives the lowest power consumption possible. Will however operate at any frequency below around 200kHz.
RC - Resistor-Capacitor
Requires connection of an external resistor and capacitor. The lowest cost way of getting an oscillator, but should not be used when any timing accuracy is required.

20. Page 20
Modos del Oscilador
b) Resistor-Capacitor
c) Externally Supplied Clock
a) Crystal or Ceramic, HS, XT, or LP
RA2
RA3
RA4/T0CKI
MCLR
V
RB0/INT
RB1
RB2
RB3 RB4
RB5
RB6
RB7
RA1
RA0
OSC1/CLKIN
OSC2/CLKOUT
SS VDD Supply voltage
Oscillator connections
Port A, Bit 0
Port A, Bit 2 Port A, Bit 1
Port A, Bit 3
*Port A, Bit 4
Ground
**Port B, Bit 0
Port B, Bit 1
Port B, Bit 2
Port B, Bit 3
Port B, Bit 7
Port B, Bit 6
Port B, Bit 5
Port B, Bit 4
*also Counter/Timer clock input
**also external Interrupt input
Reset
1
9 10
18
The Oscillator Pins

21. Page 21
Diagramas de un Oscilador Primario

22. Page 22
Acerca del Conversor Analógico a Digital ADC del PIC

23. Page 23
Acerca del ADC del PIC

24. Page 24
Agenda
•Base del Conocimiento
–Diagramas de Bode
–Diseño de Filtros Analógicos
–Diseño de un Electrocardiograma
–Microcontrolador PIC con Labview
•Motor de Inferencia
–Técnicas de Diagnóstico de un ECG
•Medios de Comunicación
–Prototipo de un ECG
ADC

25. Page 25
Acerca del ECG-UDH

26. Page 26
Características ADC del DSPIC
•Conversión vía aproximación sucesiva SAR.
•Velocidad de conversión de hasta 500 ksps.
•Hasta 16 pines de entrada analógica.
•Pines de referencia de Voltaje Externo.
•Modo Automático de Escaneo de Canal .
•Fuente seleccionable de activación de conversión.
•Buffer de resultado de conversión de 16 word
•Modos seleccionables de llenado de Buffers.
•Cuatro opciones de alineamiento de resultado.
•Modos de operación durante el estado Sleep e Idle.

27. Page 27
Acerca del ADC del PIC

28. Page 28
Flujo grama de operación del ADC

29. Page 29
Estructura Módulo A/D del PIC24F
VREF+
VREF-
A/D converter
Conversion Control
Bus Interface
Data
Format
Sample Sequence Control
AN0
AN1
S/H
AN15
CH0
8/16 Level
Results
Buffer
VR+
VR-
VR Select
AVDD
AVSS

30. Page 30
Eje y: Tiempo de Conversión A/D = Tiempo de Adquisición más Conversión
Tiempo de
Adquisición
Tiempo de Conversión
Inicio del Tiempo de Adquisición
Fin de
Conversión
Entrada
Analógica
Tiempo de Conversión A/D
Clock A/D
TAD

31. Page 31
Registro de Control ADC

32. Page 32
Eje x: Tiempo de Muestreo
AD1CON3<ADCS7:ADCS0>
TCY to 256*TCY
RCAD
FCY = FOSC/2
TAD
AD1CON3<ADRC>
1
0
AD Clock Postscaler † by 1 to 256

33. Page 33
Proceso de Operación del ADC

34. Page 34
Configuración del Clock del ADC

35. Page 35
Aspectos de Precisión Digital

36. Page 36
Diagrama de Bloques del ADC 10bits
AVDD
AVSS
VREF+
VREF-
VR+
VR-
VR Select
AD1CON2<VCFG2:VCFG0>
AVSS
AVDD
1xx
VREF-
VREF+
011
VREF-
AVDD
010
AVSS
VREF+
001
AVSS
AVDD
000
VR-
VR+
VCFG2:VCFG0
AD1CON2 Register
bit15
CSSL13=0
CSSL14=0
CSSL15=0
BUFM
bit0
ALTS
CSNA
VCFG2
VCFG1
VCFG0
bit8
SMPI1
SMPI 0
SMPI3
SMPI2
BUFS
bit7
---
---
---
---
---

37. Page 37
Diagrama de Bloques del ADC 10bits
AN0
AN1
AN15
Mux A
VR-
AN1
AD1CHS<CH0SA3:CH0SA0>
AD1CHS<CH0NA>
VINH
VINL
(0)
(1)
AD1PCFG Register
bit15
CSSL10=0
CSSL13=0
CSSL14=0
CSSL8=0
PCFG1
bit0
PCFG0
PCFG2
PCFG15
PCFG14
PCFG13
…………
bit8
AD1CON2 Register
bit15
CSSL13=0
CSSL14=0
BUFM
bit0
ALTS
CSNA
VCFG2
VCFG1
VCFG0
SMPI1
SMPI 0
SMPI3
SMPI2
BUFS
bit7
---
---
---
---
---
bit8
AD1CHS Register
bit15
CH0SA1
bit0
CH0SA0
CH0SA2
CH0NA
bit7
CH0SA3
CH0SB1
CH0SB0
CH0SB2
CH0NB
CH0SB3
---
---
---
---
---
---
AD1CSSL Register
bit15
CSSL13=0
CSSL14=0
CSSL1
bit0
CSSL0
CSSL2
CSSL15
CSSL14
CSSL13
…………

38. Page 38
Escaneo de Canales del ADC
ADCBUF Buffer
+
-
CH 0
AN15
AN14
….
AN5
AN4
AN3
AN2
AN1
AN0
+B
- B
+A
- A
VREF-
AN1
AN0
AN2
AN13
AN14
INT
ADCBUF0
AD1CSSL Register
bit15
CSSL13=0
CSSL14=0
CSSL1
bit0
CSSL0
CSSL2
CSSL15
CSSL14
CSSL13
AN13
…………
bit8
AD1CON2 Register
bit15
CSSL13=0
CSSL14=0
BUFM
bit0
ALTS
CSNA
VCFG2
VCFG1
VCFG0
SMPI1
SMPI 0
SMPI3
SMPI2
BUFS
bit7
---
---
---
---
---

39. Page 39
Diagrama de Bloques del ADC 10 bits
VINH
VINL
S/H
Mux A
Mux B
AD1CON1<ASAM>
AD1CON1<SAMP>
Señal de Conversion completa
0
1
bit8
AD1CON2 Register
bit15
CSSL13=0
BUFM
bit0
ALTS
CSNA
VCFG2
VCFG1
VCFG0
SMPI1
SMPI 0
SMPI3
SMPI2
BUFS
bit7
---
---
---
---
---

40. Page 40
Diagrama de Bloques del ADC 10 bits
VINH
VINL
S/ H
AD1CON1<ASAM>
AD1CON1<SAMP>
Conversion complete Signal
ADC1BUF0 : ADC1BUF15
RESULT
VR+
VR-
AD1CON1<DONE>
AD1CON3<SAMC4:SAMC0> (7)
0 TAD to 31 TAD
AD1CON1 <SSRC2:SSRC0>
Clearing AD1CON1<SAMP> (0)
Active Transition on INT0 pin (1)
Timer4 Compare ends (2)
Evitar 0 TAD
A/D
converter
VR-
VR+

41. Page 41
Diagrama de Bloques del ADC 10 bits
0000 00dd dddd dddd ssss sssd dddd dddd dddd dddd dd00 0000 sddd dddd dd00 0000
RESULT
FORMAT
AD1CON1<FORM1:FORM0>
AD1CON2<BUFM> = „0‟
AD1CON2<BUFS>
AD1CON2<SMPI3:SMPI0>
ADC1BUF0
: :
:
:
:
:
ADC1BUF15
AD1CON2<BUFM> = „1‟
ADC1BUF0 : : ADC1BUF7
ADC1BUF8
:
:
ADC1BUF15
0
1

42. Page 42
Ejercicio N1: Digitalizar la Señal Analógica ECG
•Tareas a realizar:
–Programar el PIC con MPLAB en C18.
–Realizar la conversión digital de una señal analógica en Proteus con PIC usando Potenciómetro.
•Resultado esperado:
–Digitalización de una señal analógica y su visualización usando LCD.

43. Page 43
Objetivos del Laboratorio
•Configurar el ADC
•Configurar los puertos de E/S
•Leer el ADC y mostrarlos en LEDs
VDD
Vss PIC24
AN5
POT R6
RA7-RA0
LEDs D10-D3

44. Page 44
Pasos a Realizar
•Open the project
–C:RTC203_PRCLab5Lab5.mcp
•Open the file
–C:RTC203_PRCLab5Lab5.c
•Look for ADCInit() function and configure ADC by initializing the registers AD1CON1, AD1CON2, and AD1CON3 looking into the Register details on the next few pages.
–STEP 1: AD1CON1
•Select Integer Format Result
•Auto Conversion Start
•Sample after conversion
–STEP 2: AD1CON2
•Select AVDD and AVSS as references
•Disable Scan mode
•Interrupt at 16th sample/Convert sequence
•16*1 level buffer
•Always use Mux A
–STEP 3: AD1CON3
•Select Sample Time = 13TAD
•Conversion Time is always 12TAD
•Select AD Clock Source such that you get 16 samples in around 1 mSec (16 ksps)
•Assume 1TCY =.25 uS (FCY = 4 MHz)

45. Page 45
Pasos a Realizar
•Continue to configure ADC by initializing the registers AD1CHS, AD1PCFG, and AD1CSSL looking into the Register details on the next few pages. STEP 4: AD1CHS Set the positive sample input channel for MUX A to use AN5 Set the negative input channel for MUX A to use VR- STEP 5: AD1PCFG Set AD1PCFG so that the only pin using analog functionality is AN5 STEP 6: AD1CSSL Channel scanning is not enabled, so no input channels should be selected for scanning
•Build the project and program the device
•Procedure to Test
–Vary the POT and observe LEDs

46. Page 46
Configurando el Registro ADC
AD1CON1: A/D CONTROL REGISTER 1
ADON
--
ADSIL
--
--
--
FORM1
FORM0
Bit:8
Bit:15
ADC Module enable bit
ADC Module enable/disable in IDLE mode
Result Format 00: Intiger (0000 00dd dddd dddd) 01: Signed Intiger (ssss sssd dddd dddd) 10: Fractional (dddd dddd dd00 0000) 11: Signed Fractional (sddd dddd dd00 0000)
SSRC2
SSRC1
SSRC0
--
--
ASAM
SAMP
DONE
Start Sampling, If ASAM is „0‟
Conversion Status bit
Bit:0
Bit:7
Conversion Trigger Source Selection Bits
000: Manual Conversion Trigger
001: Active transition on INT0 pin triggers conversion
010: Timer3 compare triggers conversion
111: Auto conversion
Auto Sample Selection bit 1: Sample immediately after completion of last conversion. 0: Sample on setting of „SAMP‟

47. Page 47
Configurando el Registro AD1CON2
VCFG2:VCFG0
VR+
VR-
000
AVDD
AVSS
001
VREF+
AVSS
010
AVDD
VREF-
011
VREF+
VREF-
1xx
AVDD
AVSS
VCFG2
VCFG2
VCFG0
--
--
CSCNA
--
--
BUFS
--
SMPI3
SMPI2
SMPI1
SMPI0
BUFM
ALTS
VR Select
AVDD
AVSS
VREF+
VREF-
VR+
VR-
VCFG2:VCFG0
Bit:8
Bit:15
Scan CH0 Mux A Input
Bit:0
Bit:7
SMPI3:SMPI0
Interrupt Event
(Sample/convert sequence)
0000
each
0001
alternate
....
….
1110
Every 15th
1111
Every 16th
Buffer Status bit, is valid only when BUFM = „1‟ 1: Buffer 8-F is being filled, can access Buffer 0-7 0: Buffer 0-7 is being filled, can access Buffer 8-F
Buffer Mode Select bit 1: Buffer configured as two 8-words buffers 0: Buffer configured as one 16-words buffers
Sample alternatively MUX-A & MUX-B

48. Page 48
Configurando el Registro AD1CON3
SAMC4:SAMC0
Sampling Time
00000
0 TAD
00001
1 TAD
....
….
11110
30 TAD
11111
31 TAD
ADRC
--
--
SAMC4
SAMC3
SAMC2
SAMC1
SAMC0
ADCS7
ADCS6
ADCS5
ADCS4
ADCS3
ADCS2
ADCS1
ADCS0
ADCS7:ADCS0
Conversion Clock
00000000
TCY ( FCY )
00000001
2*TCY ( FCY / 2 )
....
….
11111110
255*TCY ( FCY / 255 )
11111111
256*TCY ( FCY / 256 )
Bit:8
Bit:15
A/D conversion Clock Source
1: ADRC is used
0: System clock is used
Bit:0
Bit:7
A/D Sample Time Selection bits
A/D Conversion Clock Selection bits
ADCS = (TAD/TCY) - 1

49. Page 49
Configurando el Registro AD1CHS
CH0SB3:CH0SB0
CH0 Positive Input for MUX B
0000
AN0
0001
AN1
....
….
1110
AN14
1111
AN15
CH0NB
--
--
--
CH0SB3
CH0SB2
CH0SB1
CH0SB0
Bit:8
Bit:15
CH0 Negative input for MUX A 1: AN1 0: VR-
CH0NA
--
--
--
CH0SA3
CH0SA2
CH0SA1
CH0SA0
Bit:0
Bit:7
CH0SA3:CH0SA0
CH0 Positive Input for MUX A
0000
AN0
0001
AN1
....
….
1110
AN14
1111
AN15
CH0 Negative input for MUX B 1: AN1 0: VR-
VREF-
AN15
AN0
ANxx
+B
- B
+ A
- A
AN15
AN0
ANxx
VREF-
AN1
+
-
CH 0
AN1
CH0SB3:CH0SB0
CH0SA3:CH0SA0
CH0NB
CH0NA

50. Page 50
Configurando el AD1PCFG: Registro de Configuración de Puertos
PCFG15
PCFG14
PCFG13
PCFG12
PCFG11
PCFG10
PCFG9
PCFG8
Bit:8
Bit:15
Bit:0
Bit:7
PCFG7
PCFG6
PCFG5
PCFG4
PCFG3
PCFG2
PCFG1
PCFG0
Analog Input Pin Configuration Control bits 0 to 15 1: Pin for corresponding analog channel (ANxx) is in digital mode 0: Pin for corresponding analog channel (ANxx) is in analog mode
AD1CSSL : A/D Input Scan Select Regsiter
CSSL15
CSSL14
CSSL13
CSSL12
CSSL11
CSSL10
CSSL9
CSSL8
Bit:8
Bit:15
Bit:0
Bit:7
CSSL7
CSSL6
CSSL5
CSSL4
CSSL3
CSSL2
CSSL1
CSSL0
A/D Input Channel Scan Selection bits 0 to 15
1: Corresponding analog channel (ANxx) is selected for sequential scanning
0: Corresponding analog channel (ANxx) is ignored for sequential scanning

51. Page 51
Resultado Esperado
•El valor del POT es promediado cada 16 muestras en 1 ms.
•El valor del POT es mostrado en los LEDs como un valor binario desde 0 hasta 255
•El Pin RB2 cambia de valor cada 16 muestras (con una frecuencia de 500 Hz)

52. Page 52
Agenda
•Base del Conocimiento
–Diagramas de Bode
–Diseño de Filtros Analógicos
–Diseño de un Electrocardiograma
–Microcontrolador PIC con Labview
•Motor de Inferencia
–Técnicas de Diagnóstico de un ECG
•Medios de Comunicación
–Prototipo de un ECG
USB

53. Page 53
Acerca del ECG-UDH

54. Page 54
Interfaces USB
USB
• Creado por Intel en el año 1994, versión 1.0.
• En el año 1998 se lanza la versión 1.1 con una velocidad de
transferencia baja de 1.5 Mbps y a full capacidad de 12 Mbps.
• En el año 2000, se lanza la versión 2.0 de alta capacidad con 480 Mbps.

55. Page 55
USB: Bus Serial Universal
• Auto détección & configuraóion (Plug&Play)
• Energía en el Bus
• 3 velocidades: Low- 1.5 Mbps, Full- 12 Mbps,
High- 480 Megabits/second
RS232
Paralelo
PS/2
Tipos de
Aplicación
Extend the functionality of
your computer!
Data Analysis,
Data Logging,
Firmware Updates,
Diagnostics,
Embedded Applications!

56. Page 56
Características del USB
NRZI Data Encoding
Half duplex – data transmission can go in only one direction at a time
Bus Power to each device:
4.40 - 5.25 V
Guaranteed 100 mA
500 mA maximum through negotiation
~ 5.0 V ~ 3.3 V
VBUS D+ D- GND
VBUS D+ D- GND
4-wire connection
Differential Signaling

57. Page 57
Características del USB
“mini-B” Plug FS, HS Peripheral
“B” Plug FS, HS Peripheral
“A” Plug USB Host

58. Page 58
Características del USB
Guaranteed Latency Guaranteed Data
Integrity
Interrupt
Bulk
Isochronous
PIC18F4550 family supports all these transfer types.

59. Page 59
USB Pipes
HOST PC
Big USB Pipe
12Mb/s
Small Pipe to each USB
device (up to 127)
Tiny Pipes (endpoints)

60. Page 60
Client Software <-> Function
Client
Software
Interface
USB Device
Host
Endpoints
Data Flows
Buffers
Pipes

61. Page 61
El Dispositivo Lógico
Device
(Manufacturer: Microchip Technology)
(Product: Mouse in a Circle Demo)
Configuration
Interface
IN (Endpoint 0)
USB System Software
(default control pipes)
USB Device-Specific Pipe(s)
(Human Interface Device)
HID TX/RX Functions
(MCHPFSUSB FW)
Analog/Digital I/O
OUT (Endpoint 0)
IN (Endpoint x)
OUT (Endpoint x)
These settings are
represented by a
Device Descriptor
Table, stored in
firmware.

62. Page 62
Trama USB
BULK
BULK
BULK
BULK
BULK
BULK
BULK
BULK
Tx Voice
Tx Line
Interrupt,
Control,
Low Speed
Trame = 1ms
Stereo Audio
Stereo Audio
Stereo Audio
Stereo Audio
Stereo Audio
Stereo Audio
Stereo Audio
Stereo Audio
Stereo Audio
Stereo Audio
Rx Voice
Rx Line
Slot
SOF
Low Speed
Low Speed
BULK
BULK
Scanner

63. Page 63
Periféricos USB
63
Joystick
Mouse
SD Card
Reader
MCHP
RS-232
Data
UPS Logger
Keyboar
d
Generic
Human Interface Device
Class (HID)
Mass Storage
Device Class (MSD)
Communication
Device Class (CDC)
Digitizer
LibUSB WinUSB
Custom Class
(Vendor Class)
Audio
Class
MIDI
Speaker

64. Page 64
El Proceso de Enumeración
DETACHED
POWERED
Power (self/bus)
DEFAULT
Bus reset
ADDRESS
Get Device Descriptor
CONFIGURED
Get Descriptors
ATTACHED
Cable Connected
SUSPENDED

65. Page 65
Auto Detección: Full Velocidad
+5V
D+
D-GND
Transceiver
USB
Connector
Peripheral Device
VUSB 3.3 V
Full Speed Identification
D+ line pull-up
1.5 k±5%
USB PIC® MCU

66. Page 66
Auto Detección: Baja Velocidad
+5V
D+
D-GND
Transceiver
USB
Connector
Peripheral Device
VUSB 3.3 V
Low Speed Identification
D- line pull-up
1.5 k±5%
USB PIC® MCU

67. Page 67
On-chip Pull-up Resistors
+5V
D+
D-GND
Transceiver
USB
Connector
Peripheral Device
VUSB 3.3 V
On-chip pull-up resistors
available!
USB PIC® MCU

68. Page 68
Address and Configuration: EP0
 See Chapter 9 in USB 2.0 Spec for more info.
Other Endpoints
Endpoint 0 IN
(Control Data)
Endpoint 0 OUT
(Control Data)
Dual Port/Access RAM
Descriptors
Control Transfers
USB PIC® MCU

69. Page 69
Descriptores
Device
Configuration 1
Interface 0
Endpoint
Interface 1
Endpoint
Endpoint
Endpoint
To other Configurations if any
To other Interfaces if any
String 0
String 1
String N
Descriptors are typically stored in non-volatile/Flash memory

70. Page 70
Ejemplo de Descriptores
PICDEM™ USB
Microchip
Device
Configuration 1
Interface 0
Endpoint
Manu. String
Prod. String
USB 2.0, VID = 0x04D8,
PID = 0x0007, Num. Configurations, Strings?
Configuration #1: Bus-Powered,
Remote Wakeup, 500mA, Num. Interfaces
Interface #0: HID Class, Num. Endpoints
Endpoint 1 IN, Interrupt Transfer Type, 64-byte buffer, Poll every 3 ms
Unicode Characters
Go USB!
Other String

71. Page 71
MCHPFSUSB Software Framework - Device Descriptor Table -
usb_descriptors.c
Descriptors
VID & PID
Class Specific
/* Device Descriptor */
ROM USB_DEVICE_DESCRIPTOR device_dsc=
{ 0x12, // Size of this descriptor in bytes
USB_DESCRIPTOR_DEVICE, // DEVICE descriptor type
0x0200, // USB Spec Release Number
CDC_DEVICE, // Class Code
0x00, // Subclass code
0x00, // Protocol code
EP0_BUFF_SIZE, // Max packet size for EP0,
0x04D8, // Microchip Vendor ID
0x000C, // Product ID ID
…

72. Page 72
CDC – RS-232 Emulation
PC Computer
PIC® Microcontroller
USB Cable
Hyper Terminal
CDC
INF File Required
(Supplied in MCHPSUSB)
Standard Windows Drivers
Design Considerations:
•~80 KB/s max
•Bulk Transfers
•PC applications can access the device as though it is connected to a serial COM port

73. Page 73
MCHPFSUSB Framework - Polled Program Flow -
Reset
main()
InitializeSystem()
while(1)
Your application code
USBDeviceTasks()
ProcessIO()
USB Stack
Cooperative Multitasking!!
No blocking functions.
Use state machine.
You edit UserInit()
Function Services
CDCTxService() MSDTasks() Re-arm OUT Endpoint (HID & Generic)

74. Page 74
MCHPFSUSB Framework - Interrupt Program Flow -
Reset
main()
InitializeSystem()
while(1)
Your application code
ProcessIO()
You edit UserInit()
USB Interrupt Context
USBDeviceTasks()
USBDeviceAttach()
Function Services
Notifies the stack when the device is attached
CDCTxService() MSDTasks() Re-arm OUT Endpoint (HID & Generic)

75. Page 75
Código de Ejemplo
#include “Compiler.h” #include “USBusb.h” #include “USBusb_function_cdc.h” #include “HardwareProfile.h” void UserInit(void){ … … } void ProcessIO(void){ if((USBDeviceState < CONFIGURED_STATE)||(USBSuspendControl==1)) return; … … CDCTxService(); } static void InitializeSystem(void){ #if define … #endif UserInit(); USBDeviceInit(); } int main(void){ InitializeSystem(); USBDeviceAttach(); while(1){ ProcessIO(); } }
Main.c
Needed (usb_config.h is called by usb.h)
Put your initialization code here
Put your application code (state machine) here
No need to change
Conditional compiling (no need to change)
USBDeviceTasks() is executed in an ISR (High Priority PIC18, _USB1Interrupt() PIC24 & PIC32)

76. Page 76
Agenda
•Base del Conocimiento
–Diagramas de Bode
–Diseño de Filtros Analógicos
–Diseño de un Electrocardiograma
–Microcontrolador PIC con Labview
•Motor de Inferencia
–Técnicas de Diagnóstico de un ECG
•Medios de Comunicación
–Prototipo de un ECG
GLCD

77. Page 77
Acerca del ECG-UDH

78. Page 78
Pantallas Gráficas LCD (GLCD)
RA0/AN02RA1/AN13RA2/AN2/VREF-/CVREF4RA3/AN3/VREF+ 5RA4/T0CKI/C1OUT/RCV6RA5/AN4/SS/LVDIN/C2OUT7RA6/OSC2/CLKO14OSC1/CLKI13RB0/AN12/INT0/FLT0/SDI/SDA33RB1/AN10/INT1/SCK/SCL34RB2/AN8/INT2/VMO35RB3/AN9/CCP2/VPO36RB4/AN11/KBI0/CSSPP37RB5/KBI1/PGM38RB6/KBI2/PGC39RB7/KBI3/PGD40RC0/T1OSO/T1CKI15RC1/T1OSI/CCP2/UOE16RC2/CCP1/P1A17VUSB18RC4/D-/VM23RC5/D+/VP24RC6/TX/CK25RC7/RX/DT/SDO26RD0/SPP019RD1/SPP120RD2/SPP221RD3/SPP322RD4/SPP427RD5/SPP5/P1B28RD6/SPP6/P1C29RD7/SPP7/P1D30RE0/AN5/CK1SPP8RE1/AN6/CK2SPP9RE2/AN7/OESPP10RE3/MCLR/VPP1U2PIC18F4550X1CRYSTALC122pFC222pF12345ICSP 1-5CONN-SIL5MCLRPGDPGCMCLRPGCPGD1234AN 4-3-ECGCONN-H4 CS11CS22GND3VCC4V05RS6R/W7E8DB09DB110DB211DB312DB413DB514DB615DB716RST17-Vout18 LCD2AMPIRE128X64CS1CS2 CS1CS2 DI DI RWERST RWERST 12 3 RV410k 12345 J2CONN-SIL5U2(RC0/T1OSO/T1CKI) R410k1265Pasa U57809C12100nFC13100nFC14100uF16VC15100uF16VC16100nFC17100nFVI1VO3 U77805 VDD V+ V- V+ VCC1D+ 3D- 2GND4J3USBCONN321 DE ALIMENTACION +/- 9V y 5V326 7481 U1OP07V+ 326 7481 U8OP07V- R310kR1410kSUMADOR

79. Page 79
Características de los GLCD

80. Page 80
Controladores GLCD para Escribir Byte 0xAB

81. Page 81
Instrucciones del Controlador GLCD

82. Page 82
Diagrama de Bloque del Controlador GLCD

83. Page 83
Código del Proyecto ECG

84. Page 84
Agenda:
UDH Rumbo a la Acreditación Internacional