PIC16F7X Datasheet, PDF (12/174 Pages) Microchip Technology – 28/40-Pin 8-Bit CMOS FLASH Microcontrollers

PIC16F7X
TABLE 1-3: PIC16F74 AND PIC16F77 PINOUT DESCRIPTION
Pin Name
DIP PLCC QFP I/O/P
Pin# Pin# Pin# Type
Buffer
Type
Description
OSC1/CLKI
OSC1
CLKI
OSC2/CLKO
OSC2
CLKO
13
14
30
14
15
31
ST/CMOS⁽⁴⁾ Oscillator crystal or external clock input.
I
Oscillator crystal input or external clock source input.
ST buffer when configured in RC mode. Otherwise
I
CMOS.
External clock source input. Always associated with pin
function OSC1 (see OSC1/CLKI, OSC2/CLKO pins).
—
Oscillator crystal or clock output.
O
Oscillator crystal output.
Connects to crystal or resonator in Crystal Oscillator
mode.
O
In RC mode, OSC2 pin outputs CLKO, which has 1/4
the frequency of OSC1 and denotes the instruction
cycle rate.
MCLR/VPP
MCLR
VPP
1
2
18
I
P
ST
Master Clear (input) or programming voltage (output).
Master Clear (Reset) input. This pin is an active low
RESET to the device.
Programming voltage input.
PORTA is a bi-directional I/O port.
RA0/AN0
RA0
AN0
2
3
19
TTL
I/O
I
Digital I/O.
Analog input 0.
RA1/AN1
RA1
AN1
3
4
20
TTL
I/O
I
Digital I/O.
Analog input 1.
RA2/AN2
RA2
AN2
4
5
21
TTL
I/O
I
Digital I/O.
Analog input 2.
RA3/AN3/VREF
RA3
AN3
VREF
5
6
22
TTL
I/O
I
I
Digital I/O.
Analog input 3.
A/D reference voltage input.
RA4/T0CKI
RA4
T0CKI
6
7
23
ST
I/O
I
Digital I/O – Open drain when configured as output.
Timer0 external clock input.
RA5/SS/AN4
RA5
SS
AN4
7
8
24
TTL
I/O
I
I
Digital I/O.
SPI slave select input.
Analog input 4.
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.
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.
DS30325B-page 10
 2002 Microchip Technology Inc.