PIC12F635/PIC16F636/639
FIGURE 1-2:
PIC16F636 BLOCK DIAGRAM
Configuration
13
8
PORTA
Data Bus
Program Counter
RA0
RA1
RA2
RA3
RA4
RA5
Flash
2K x 14
Program
RAM
128
bytes
8-level Stack
(13-bit)
Memory
File
Registers
Program
Bus
14
RAM Addr
9
Addr MUX
Instruction Reg
PORTC
Indirect
Addr
7
Direct Addr
8
RC0
RC1
RC2
RC3
RC4
RC5
FSR Reg
STATUS Reg
8
3
Power-up
Timer
MUX
Oscillator
Instruction
Decode and
Control
Start-up Timer
ALU
Power-on
Reset
8
Watchdog
Timer
OSC1/CLKIN
W Reg
Timing
Generation
Brown-out
Reset
OSC2/CLKOUT
Programmable
Low-Voltage Detect
8 MHz
Internal
Oscillator
31 kHz
Internal
Oscillator
Wake-up
Reset
T1CKI T1G
VDD
VSS
MCLR
Timer0
Timer1
T0CKI
2 Analog Comparators
and Reference
Cryptographic
Module
EEDAT
256 bytes
Data
EEPROM
EEADDR
C1IN- C1IN+ C1OUT C2IN- C2IN+ C2OUT
DS41232D-page 10
© 2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
