Ra5/An4/Ss/C2Out - Microchip Technology PIC16F87XA Datasheet

FIGURE 1-2: PIC16F874A/877A BLOCK DIAGRAM
Flash
Program
Memory
Program
14
Bus
Instruction reg
Instruction
Decode &
Control
Timing
Generation
OSC1/CLKI
OSC2/CLKO
Timer0 Timer1
Data EEPROM
CCP1,2
Device
PIC16F874A
PIC16F877A
Note 1: Higher order bits are from the Status register.
 2003 Microchip Technology Inc.
http://www.xinpian.net
13
Data Bus
Program Counter
8 Level Stack
(13-bit)
Registers
(1)
RAM Addr
Addr MUX
7
Direct Addr
8
3
Power-up
Timer
Oscillator
Start-up Timer
Power-on
8
Reset
Watchdog
W reg
Timer
Brown-out
Reset
In-Circuit
Debugger
Low-Voltage
Programming
MCLR V , V
DD SS
Timer2
10-bit A/D
Synchronous
Serial Port
Program Flash
4K words
8K words
提供单片机解密、IC解密、芯片解密业务
PIC16F87XA
8
PORTA
RAM
File
PORTB
9
Indirect
8
Addr
FSR reg
Status reg
PORTC
MUX
ALU
PORTD
PORTE
Parallel
Slave Port
Comparator
USART
Data Memory
192 Bytes
368 Bytes
010-62245566
RA0/AN0
RA1/AN1
RA2/AN2/V -/CV
REF REF
RA3/AN3/V +
REF
RA4/T0CKI/C1OUT

RA5/AN4/SS/C2OUT

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/TX/CK
RC7/RX/DT
RD0/PSP0
RD1/PSP1
RD2/PSP2
RD3/PSP3
RD4/PSP4
RD5/PSP5
RD6/PSP6
RD7/PSP7
RE0/RD/AN5
RE1/WR/AN6
RE2/CS/AN7
Voltage
Reference
Data EEPROM
128 Bytes
256 Bytes
DS39582B-page 7
13810019655