PIC16F870_13 Datasheet, PDF (9/172 Pages) Microchip Technology – 28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

PIC16F870/871
TABLE 1-2: PIC16F871 PINOUT DESCRIPTION (CONTINUED)
Pin Name
DIP PLCC QFP I/O/P
Pin# Pin# Pin# Type
Buffer
Type
Description
PORTD is a bi-directional I/O port or parallel slave port when
interfacing to a microprocessor bus.
RD0/PSP0
19
21
38
I/O
ST/TTL⁽³⁾
RD1/PSP1
20
22
39
I/O
ST/TTL⁽³⁾
RD2/PSP2
21
23
40
I/O
ST/TTL⁽³⁾
RD3/PSP3
22
24
41
I/O
ST/TTL⁽³⁾
RD4/PSP4
27
30
2
I/O
ST/TTL⁽³⁾
RD5/PSP5
28
31
3
I/O
ST/TTL⁽³⁾
RD6/PSP6
29
32
4
I/O
ST/TTL⁽³⁾
RD7/PSP7
30
33
5
I/O
ST/TTL⁽³⁾
PORTE is a bi-directional I/O port.
RE0/RD/AN5
8
9
25
I/O
ST/TTL⁽³⁾
RE0 can also be read control for the parallel slave port, or
analog input 5.
RE1/WR/AN6
9
10
26
I/O
ST/TTL⁽³⁾
RE1 can also be write control for the parallel slave port, or
analog input 6.
RE2/CS/AN7
10
11
27
I/O
ST/TTL⁽³⁾
RE2 can also be select control for the parallel slave port,
or analog input 7.
VSS
12,31 13,34 6,29 P
—
Ground reference for logic and I/O pins.
VDD
11,32 12,35 7,28 P
—
Positive supply for logic and I/O pins.
NC
— 1,17,28, 12,13,
—
These pins are not internally connected. These pins should be
40
33,34
left unconnected.
Legend:
Note 1:
2:
3:
4:
I = input
O = output
I/O = input/output
P = power
— = Not used
TTL = TTL input
ST = Schmitt Trigger input
This buffer is a Schmitt Trigger input when configured as an external interrupt or LVP mode.
This buffer is a Schmitt Trigger input when used in Serial Programming mode.
This buffer is a Schmitt Trigger input when configured as general purpose I/O and a TTL input when used in the Parallel
Slave Port mode (for interfacing to a microprocessor bus).
This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.
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DS30569C-page 9