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