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PIC16F87XATI/SP Datasheet - Page 6

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PIC16F87XA
FIGURE 1-1:
PIC16F873A/876A BLOCK DIAGRAM
13
Flash
Program
Memory
Program
14
Bus
Instruction reg
Direct Addr
8
Instruction
Decode &
Control
Timing
Generation
OSC1/CLKI
OSC2/CLKO
MCLR
Timer0
Timer1
Data EEPROM
CCP1,2
Device
PIC16F873A
PIC16F876A
Note 1: Higher order bits are from the Status register.
DS39582C-page 6
8
Data Bus
Program Counter
RAM
8 Level Stack
File
(13-bit)
Registers
(1)
RAM Addr
9
Addr MUX
Indirect
7
8
Addr
FSR reg
Status reg
3
MUX
Power-up
Timer
Oscillator
Start-up Timer
ALU
Power-on
Reset
8
Watchdog
W reg
Timer
Brown-out
Reset
In-Circuit
Debugger
Low-Voltage
Programming
V
, V
DD
SS
Timer2
10-bit A/D
Synchronous
USART
Serial Port
Program Flash
Data Memory
4K words
192 Bytes
8K words
368 Bytes
PORTA
RA0/AN0
RA1/AN1
RA2/AN2/V
-/CV
REF
REF
RA3/AN3/V
+
REF
RA4/T0CKI/C1OUT
RA5/AN4/SS/C2OUT
PORTB
RB0/INT
RB1
RB2
RB3/PGM
RB4
RB5
RB6/PGC
RB7/PGD
PORTC
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC6/TX/CK
RC7/RX/DT
Voltage
Comparator
Reference
Data EEPROM
128 Bytes
256 Bytes
 2001-2013 Microchip Technology Inc.

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