PIC16F87XA
FIGURE 1-1:
PIC16F873A/876A BLOCK DIAGRAM
13
Program Counter
FLASH
Program
Memory
Data Bus
8
PORTA
RA0/AN0
RA1/AN1
RA2/AN2/V
REF
-/CV
REF
RA3/AN3/V
REF
+
RA4/T0CKI/C1OUT
RA5/AN4/SS/C2OUT
8 Level Stack
(13-bit)
RAM
File
Registers
RAM Addr
(1)
Program
Bus
14
Instruction reg
Direct Addr
7
9
Addr MUX
8
Indirect
Addr
PORTB
RB0/INT
RB1
RB2
RB3/PGM
RB4
RB5
RB6/PGC
RB7/PGD
FSR reg
STATUS reg
8
3
Power-up
Timer
Instruction
Decode &
Control
Timing
Generation
OSC1/CLKIN
OSC2/CLKOUT
Oscillator
Start-up Timer
Power-on
Reset
Watchdog
Timer
Brown-out
Reset
In-Circuit
Debugger
Low Voltage
Programming
8
MUX
ALU
PORTC
W reg
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC6/TX/CK
RC7/RX/DT
MCLR
V
DD
, V
SS
Timer0
Timer1
Timer2
10-bit A/D
Data EEPROM
CCP1,2
Synchronous
Serial Port
USART
Comparator
Voltage
Reference
Device
PIC16F873A
PIC16F876A
Program FLASH
4K words
8K words
Data Memory
192 Bytes
368 Bytes
Data EEPROM
128 Bytes
256 Bytes
Note 1:
Higher order bits are from the STATUS register.
DS39582A-page 6
Advance Information
2001 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
