PIC16F87X
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 complemen-
tary document to this data sheet, and is highly recom-
mended reading for a better understanding of the device
architecture and operation of the peripheral modules.
There are four devices (PIC16F873, PIC16F874,
PIC16F876 and PIC16F877) covered by this data
sheet. The PIC16F876/873 devices come in 28-pin
packages and the PIC16F877/874 devices come in
40-pin packages. The Parallel Slave Port is not
implemented on the 28-pin devices.
The following device block diagrams are sorted by pin
number; 28-pin for Figure 1-1 and 40-pin for Figure 1-2.
The 28-pin and 40-pin pinouts are listed in Table 1-1
and Table 1-2, respectively.
FIGURE 1-1:
Device
PIC16F873
PIC16F876
PIC16F873 AND PIC16F876 BLOCK DIAGRAM
Program
FLASH
4K
8K
Data Memory
192 Bytes
368 Bytes
13
Program Counter
FLASH
Program
Memory
Data
EEPROM
128 Bytes
256 Bytes
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
PORTC
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
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
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC6/TX/CK
RC7/RX/DT
W reg
MCLR
V
DD
, V
SS
Timer0
Timer1
Timer2
10-bit A/D
Data EEPROM
CCP1,2
Synchronous
Serial Port
USART
Note 1:
Higher order bits are from the STATUS register.
2001 Microchip Technology Inc.
DS30292C-page 5
MICROCHIP [ MICROCHIP TECHNOLOGY ]
