Datasheet

PIC16F7X
DS30325B-page 8  2002 Microchip Technology Inc.
TABLE 1-2: PIC16F73 AND PIC16F76 PINOUT DESCRIPTION
Pin Name
DIP
SSOP
SOIC
Pin#
MLF
Pin#
I/O/P
Type
Buffer
Type
Description
OSC1/CLKI
OSC1
CLKI
96
I
I
ST/CMOS
(3)
Oscillator crystal or external clock input.
Oscillator crystal input or external clock source input. ST
buffer when configured in RC mode. Otherwise CMOS.
External clock source input. Always associated with pin
function OSC1 (see OSC1/CLKI, OSC2/CLKO pins).
OSC2/CLKO
OSC2
CLKO
10 7
O
O
— Oscillator crystal or clock output.
Oscillator crystal output.
Connects to crystal or resonator in Crystal Oscillator
mode.
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
126
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
227
I/O
I
TTL
Digital I/O.
Analog input 0.
RA1/AN1
RA1
AN1
328
I/O
I
TTL
Digital I/O.
Analog input 1.
RA2/AN2
RA2
AN2
41
I/O
I
TTL
Digital I/O.
Analog input 2.
RA3/AN3/V
REF
RA3
AN3
V
REF
52
I/O
I
I
TTL
Digital I/O.
Analog input 3.
A/D reference voltage input.
RA4/T0CKI
RA4
T0CKI
64
I/O
I
ST
Digital I/O – Open drain when configured as output.
Timer0 external clock input.
RA5/SS/
AN4
RA5
SS
AN4
75
I/O
I
I
TTL
Digital I/O.
SPI slave select input.
Analog input 4.
Legend: I = input O = output I/O = input/output P = power
— = Not used TTL = TTL input ST = Schmitt Trigger input
Note 1: This buffer is a Schmitt Trigger input when configured as the external interrupt.
2: This buffer is a Schmitt Trigger input when used in Serial Programming mode.
3: This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.