PIC16F872_06 Datasheet, PDF (6/168 Pages) Microchip Technology – 28-Pin, 8-Bit CMOS Flash Microcontroller with 10-Bit A/D

PIC16F872
FIGURE 1-1:
PIC16F872 BLOCK DIAGRAM
FLASH
Program
Memory
Program
Bus
14
Instruction reg
13
Program Counter
Data Bus
8
8 Level Stack
(13-bit)
RAM
File
Registers
RAM Addr (1) 9
Addr MUX
Direct Addr ⁷
Indirect
8 Addr
FSR reg
STATUS reg
8
Instruction
Decode &
Control
OSC1/CLKIN
OSC2/CLKOUT
Timing
Generation
Power-up
Timer
Oscillator
Start-up Timer
Power-on
Reset
Watchdog
Timer
Brown-out
Reset
In-Circuit
Debugger
Low Voltage
Programming
3
MUX
ALU
8
W reg
Timer0
MCLR VDD, VSS
Timer1
Timer2
PORTA
PORTB
PORTC
RA0/AN0
RA1/AN1
RA2/AN2/VREF-
RA3/AN3/VREF+
RA4/T0CKI
RA5/AN4/SS
RB0/INT
RB1
RB2
RB3/PGM
RB4
RB5
RB6/PGC
RB7/PGD
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC6
RC7
Data EEPROM
CCP
Synchronous
Serial Port
10-bit A/D
Note 1: Higher order bits are from the STATUS register.
DS30221C-page 4
© 2006 Microchip Technology Inc.