Datasheet

 2000-2013 Microchip Technology Inc. DS30569C-page 5
PIC16F870/871
1.0 DEVICE OVERVIEW
This document contains device specific information.
Additional information may be found in the PICmicro
TM
Mid-Range MCU Family Reference Manual
(DS33023), which may be obtained from your local
Microchip Sales Representative or downloaded from
the Microchip web site. The Reference Manual should
be considered a complementary document to this data
sheet, and is highly recommended reading for a better
understanding of the device architecture and operation
of the peripheral modules.
There are two devices (PIC16F870 and PIC16F871)
covered by this data sheet. The PIC16F870 device
comes in a 28-pin package and the PIC16F871 device
comes in a 40-pin package. The 28-pin device does not
have a Parallel Slave Port implemented.
The following two figures are device block diagrams
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: PIC16F870 BLOCK DIAGRAM
FLASH
Program
Memory
13
Data Bus
8
14
Program
Bus
Instruction reg
Program Counter
8 Level Stack
(13-bit)
RAM
File
Registers
Direct Addr
7
RAM Addr (1)
9
Addr MUX
Indirect
Addr
FSR reg
STATUS reg
MUX
ALU
W reg
Power-up
Timer
Oscillator
Start-up Timer
Power-on
Reset
Watchdog
Timer
Instruction
Decode &
Control
Timing
Generation
OSC1/CLKI
OSC2/CLKO
MCLR
VDD, VSS
PORTA
PORTB
PORTC
RA4/T0CKI
RA5/AN4
RB0/INT
RC0/T1OSO/T1CKI
RC1/T1OSI
RC2/CCP1
RC3
RC4
RC5
RC6/TX/CK
RC7/RX/DT
8
8
Brown-out
Reset
Note 1: Higher order bits are from the STATUS register.
USART
CCP1
10-bit A/DTimer0 Timer1 Timer2
RA3/AN3/VREF+
RA2/AN2/VREF-
RA1/AN1
RA0/AN0
8
3
Data EEPROM
RB1
RB2
RB3/PGM
RB4
RB5
RB6/PGC
RB7/PGD
Device Program FLASH Data Memory Data EEPROM
PIC16F870 2K 128 Bytes 64 Bytes
In-Circuit
Debugger
Low-Voltage
Programming