Unit2.2 8051
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This document discusses input/output (I/O) ports on microcontrollers, specifically the 8051 microcontroller. It defines what ports are, which are the important I/O ports on the 8051 (P0-P3), and how each pin on the ports can be configured as an input or output. It also provides details on the hardware structure of each I/O pin, including how writing a 1 or 0 to the output pin sets the pin high or low, and how reading from an input pin works.
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8051 Microcontroller
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It may not interact directly with the environment
For example – A microcomputer in a car ignition control
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The document provides information about training performed on the AVR microcontroller. It discusses the features of the ATmega8 microcontroller including its architecture, memory, I/O ports, and peripherals. It also describes tasks performed during training such as interfacing LEDs, buttons, keypads, displays, ADC, and DC motors to learn about digital I/O, serial communication, and analog input.
Chp4 introduction to the pic microcontroller copy
The document provides an introduction to the PIC microcontroller, including:
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3) It explains the core components of the PIC16F84 including ports, memory organization, clock generator, and the central processing unit.
8051.pptx
The document discusses microprocessors and microcontrollers. It describes how microprocessors have external RAM, ROM, and I/O ports, while microcontrollers have RAM, ROM, I/O ports, and other components integrated into a single chip. The 8051 microcontroller is presented as a common example that has on-chip memory and I/O in addition to a CPU. Key features of the 8051 such as its memory organization, registers, addressing modes, and instruction set are outlined.
Micro lec note2
The document discusses the 8051 microcontroller. It describes the basic components of the 8051 including 4K bytes of internal ROM, 128 bytes of internal RAM, four 8-bit I/O ports, two 16-bit timers/counters, one serial interface. A block diagram shows the connection of these components. It provides examples of embedded systems using the 8051 and discusses criteria for choosing a microcontroller. Tables compare features of different 8051 family members. Pin functions are explained including power, clock, reset, and I/O pins.
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Unit2.2 8051
- 1. Unit -II Introduction to Microcontrollers: • Overview of 8051 Microcontroller, Architecture, I/O Ports, • Memory Organization, • Addressing Modes and Instruction set of 8051. 8051 Real Time Control: • Programming Timer Interrupts, • Programming External Hardware Interrupts, Programming the Serial Communication Interrupts, • Programming 8051 Timers and Counters
- 4. Port • Term "port" refers to a group of pins on a microcontroller which can be accessed simultaneously, or on which we can set the desired combination of zeros and ones, or read from them an existing status. • Physically, port is a register inside a microcontroller which is connected by wires to the pins of a microcontroller. • All port pins can be designated as input or output, according to the needs of a device that's being developed.
- 5. Important Pins (IO Ports) • One of the most useful features = 4 I/O ports (P0 - P3) Port 0 :-P0 = (P0.0 - P0.7) – 8-bit R/W - General Purpose I/O – low byte address and data bus for external memory • Port 1 :- P1= (P1.0 - P1.7) – Only 8-bit R/W - General Purpose I/O • Port 2 :- P2 = (P2.0 - P2.7) – 8-bit R/W - General Purpose I/O – high byte address for external memory • Port 3:- P3 = (P3.0 - P3.7) – General Purpose I/O – Timers(T0,T1) – ext. int (INT0, INT1) – Serial (TXD, RXD)- RD,WR Each port can be used as input or output (bi-direction)
- 6. Port 3 Alternate Functions
- 8. Port1 Hardware Structure of I/O Pin D Q Clk Q Vcc Internal Pull-Up Read latch Read pin Write to latch Internal CPU bus M1 P1.X pin P1.X B1 B2
- 9. Hardware Structure of I/O Pin • Each pin of I/O ports – Internally connected to CPU bus – A D latch store the value of this pin • Write to latch＝1：write data into the D latch – 2 Tri-state buffer： • B1: controlled by “Read pin” – Read pin＝1：really read the data present at the pin • B2: controlled by “Read latch” – Read latch＝1：read value from internal latch – A transistor M1 gate • Gate=0: open • Gate=1: close
- 10. Writing “1” to Output Pin P1.X D Q Clk Q Vcc Internal Pull-Up Read latch Read pin Write to latch Internal CPU bus M1 P1.X pin P1.X 2. output pin is Vcc 1. write a 1 to the pin 1 0 output 1 B1 B2
- 11. Writing “0” to Output Pin P1.X D Q Clk Q Vcc Internal Pull-Up Read latch Read pin Write to latch Internal CPU bus M1 P1.X pin P1.X 2. output pin is ground 1. write a 0 to the pin 0 1 output 0 B1 B2
- 14. Reading “High” at Input Pin D Q Clk Q Vcc Internal Pull-Up Read latch Read pin Write to latch Internal CPU bus M1 P1.X pin P1.X 2. MOV A,P1 external pin=High 1. write a 1 to the pin MOV P1,#0FFH 1 0 3. Read pin=1 Read latch=0 1 B1 B2
- 15. Reading “Low” at Input Pin D Q Clk Q Vcc Internal Pull-Up Read latch Read pin Write to latch Internal CPU bus M1 P1.X pin P1.X 8051 IC 2. MOV A,P1 external pin=Low 1. write a 1 to the pin MOV P1,#0FFH 1 0 3. Read pin=1 Read latch=0 0 B1 B2