
1997 Microchip Technology Inc.
DS30272A-page 9
PIC16C71X
TABLE 3-1:
PIC16C710/71/711/715 PINOUT DESCRIPTION
Pin Name
DIP
Pin#
SSOP
Pin#(4)
SOIC
Pin#
I/O/P
Type
Buffer
Type
Description
OSC1/CLKIN
16
18
16
I
ST/CMOS(3) Oscillator crystal input/external clock source input.
OSC2/CLKOUT
15
17
15
O
—
Oscillator crystal output. Connects to crystal or resonator in crystal
oscillator mode. In RC mode, OSC2 pin outputs CLKOUT which has
1/4 the frequency of OSC1, and denotes the instruction cycle rate.
MCLR/VPP
4
I/P
ST
Master clear (reset) input or programming voltage input. This pin is
an active low reset to the device.
PORTA is a bi-directional I/O port.
RA0/AN0
17
19
17
I/O
TTL
RA0 can also be analog input0
RA1/AN1
18
20
18
I/O
TTL
RA1 can also be analog input1
RA2/AN2
1
I/O
TTL
RA2 can also be analog input2
RA3/AN3/VREF
2
I/O
TTL
RA3 can also be analog input3 or analog reference voltage
RA4/T0CKI
3
I/O
ST
RA4 can also be the clock input to the Timer0 module. Output is
open drain type.
PORTB is a bi-directional I/O port. PORTB can be software pro-
grammed for internal weak pull-up on all inputs.
RB0/INT
6
7
6
I/O
TTL/ST(1)
RB0 can also be the external interrupt pin.
RB1
7
8
7
I/O
TTL
RB2
8
9
8
I/O
TTL
RB3
9
10
9
I/O
TTL
RB4
10
11
10
I/O
TTL
Interrupt on change pin.
RB5
11
12
11
I/O
TTL
Interrupt on change pin.
RB6
12
13
12
I/O
TTL/ST(2)
Interrupt on change pin. Serial programming clock.
RB7
13
14
13
I/O
TTL/ST(2)
Interrupt on change pin. Serial programming data.
VSS
5
4, 6
5
P
—
Ground reference for logic and I/O pins.
VDD
14
15, 16
14
P
—
Positive supply for logic and I/O pins.
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 congured 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 congured in RC oscillator mode and a CMOS input otherwise.
4:
The PIC16C71 is not available in SSOP package.