this is most used 14bit PIC microcontroller. very helpful for hobby project and engg. final year projects....

1. Basaveshwar Engineering College (Autonomous),
Bagalkot.
Department of Instrumentation Technology
“PIC Microcontroller”
Seminar Guide : Prof. Santosh B. K.
Presented by: Sagar S. Sarvade
USN: 2BA09IT015
Roll: 12
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2. Content
• What is microcontroller?
• PIC microcontrollers
• Features of PIC16F84
• Architecture of PIC16F84
1. CPU
2. status register
3. memory
• INTCON register
• Instruction set
• Advantages & limitations
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3. What is a microcontroller?
• It is a computer on a
single chip.
• A single chip contain
processor, RAM & ROM
memory, clock, & I/O
control unit.
• It is also called as “system
on chip”.
• Microcontrollers are
designed for embedded
applications.
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4. PIC Microcontrollers
• Peripheral Interface Controller(PIC) is a family
of microcontrollers by Microchip Technology.
• Harvard architecture.
• 3 types:
a. 12-bit instruction word MCU
b. 14-bit instruction word MCU
c. 16-bit instruction word MCU
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5. Features of PIC16F84:
• 14-bit instruction word
• 18 pin device
• 13 I/O pins
• 68 bytes of RAM
• 1k word of program
ROM
• 64 bytes of EEPROM
• One 8-bit timer
• One watchdog timer
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6. Architecture of PIC16F84
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7. CPU:
• It has instruction decoder, ALU, control unit.
• It has only one accumulator, called as working
register.
• Supports RISC architecture.
• Has 35 simple instructions.
• Execution time is very less.(approx. 0.2µs)
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8. Status register:
• RPO: register bank select
• TO: watchdog timer time-out bit
• PD: power down bit
• z: zero bit
• DC: digital carry bit
• C: carry bit
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9. Memory:
Program memory:
• 13-bit program counter
• 8 stack level of 13-bit
• Reset vector &
peripheral interrupt
vector.
• Only 1k memory is
implemented.
• Remaining is left
unimplemented
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10. Data memory:
• 2 register banks
• Bank is selected by bit-5
of status register.
• 68 bytes for general
purpose
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11. INTCON register:
• GIE: global interrupt enable
• EEIE: EE write complete interrupt
• TOIE: TMRO timer overflow interrupt
• INTE: INT external interrupt
• RBIE: RB port change interrupt
• TOIF: TMRO overflow flag
• INTF: external interrupt flag
• RBIF: RB port change interrupt flag
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12. Instruction set:
• Only 35 instructions.
• 3 types of instructions:
1. Byte-oriented
Ex: a) addwf f,d, b)andwf f,d. etc..
2. Bit-oriented
Ex: a)bcf f, b, b)bsf f, b. etc..
3. Literal & control operations
Ex: a)addlw k, b)andlw k etc..
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13. Advantages: Limitations:
• Easy to learn • Only one working
• Fast execution due register.
to RISC architecture. • Register bank
• Inexpensive switching required to
• Wide range of access entire RAM.
interfaces including
USB, USART.
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14. Conclusion:
• Thus PIC microcontrollers are easier to
program for interfacing, & has Fast response.
• PIC microcontrollers can be used for industrial
purpose.
• small and inexpensive PIC microcontrollers
can be used for hobby and educational
purpose.
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15. References:
• PIC microcontrollers by Elsevier, edition 2008
• The Quintessential PIC Microcontroller by Sid
Katzen
• www.microchip.com
• www.slideshare.com
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16. Thank you….
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17. Any queries???
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