PIC16F872
1.0
DEVICE OVERVIEW
This document contains device-specific information.
Additional information may be found in the PICmicro™
Mid-Range Reference Manual, (DS33023), which may
be obtained from your local Microchip Sales Represen-
tative or downloaded from the Microchip website. The
Reference Manual should be considered a comple-
mentary document to this data sheet, and is highly rec-
ommended reading for a better understanding of the
device architecture and operation of the peripheral
modules.
This data sheet covers the PIC16F872 device. The
PIC16F872 is a 28-pin device and its block diagram is
shown in Figure 1-1.
FIGURE 1-1:
Device
PIC16F872
PIC16F872 BLOCK DIAGRAM
Program
FLASH
2K
Data Memory
128 Bytes
Data
EEPROM
64 Bytes
13
Program Counter
FLASH
Program
Memory
8 Level Stack
(13-bit)
Program
Bus
14
Instruction reg
Direct Addr
7
Data Bus
8
PORTA
RA0/AN0
RA1/AN1
RA2/AN2/V
REF
-
RA3/AN3/V
REF
+
RA4/T0CKI
RA5/AN4/SS
PORTB
RB0/INT
RB1
RB2
RB3/PGM
RB4
RB5
RB6/PGC
RB7/PGD
RC0/T1OSO/T1CKI
RC1/T1OSI
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC6
RC7
RAM
File
Registers
RAM Addr (1)
9
Addr MUX
8
Indirect
Addr
FSR reg
STATUS reg
8
3
PORTC
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
W reg
MCLR
V
DD
, V
SS
Timer0
Timer1
Timer2
10-bit A/D
Data EEPROM
CCP1
Synchronous
Serial Port
Note 1:
Higher order bits are from the STATUS register.
©
1999 Microchip Technology Inc.
Preliminary
DS30221A-page 5
MICROCHIP [ MICROCHIP TECHNOLOGY ]
