PIC16F627A Datasheet, PDF (12/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

PIC16F627A/628A/648A
FIGURE 3-1:
BLOCK DIAGRAM
FLASH
Program
Memory
13
Program Counter
8-Level Stack
(13-bit)
Data Bus
8
RAM
File
Registers
Program
Bus
14
Instruction reg
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
Detect
Low-Voltage
Programming
3
MUX
ALU
8
W reg
PORTA
PORTB
RA0/AN0
RA1/AN1
RA2/AN2/VREF
RA3/AN3/CMP1
RA4/T0CK1/CMP2
RA5/MCLR/VPP
RA6/OSC2/CLKOUT
RA7/OSC1/CLKIN
RB0/INT
RB1/RX/DT
RB2/TX/CK
RB3/CCP1
RB4/PGM
RB5
RB6/T1OSO/T1CKI/PGC
RB7/T1OSI/PGD
Comparator
MCLR VDD, VSS
Timer0
Timer1
Timer2
VREF
CCP1
USART
Data EEPROM
Note: Higher order bits are from the STATUS register.
DS40044A-page 10
Preliminary
 2002 Microchip Technology Inc.