Datasheet

PIC16C6X
DS30234E-page 14  1997-2013 Microchip Technology Inc.
TABLE 3-1: PIC16C61 PINOUT DESCRIPTION
Pin Name
DIP
Pin#
SOIC
Pin#
Pin Type
Buffer
Type
Description
OSC1/CLKIN 16 16 I
ST/CMOS
(1)
Oscillator crystal input/external clock source input.
OSC2/CLKOUT 15 15 O — Oscillator crystal output. Connects to crystal or resonator in crystal
oscillator mode. In RC mode, the pin outputs CLKOUT which has
1/4 the frequency of OSC1, and denotes the instruction cycle rate.
MCLR
/VPP
4 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 17 17 I/O TTL
RA1 18 18 I/O TTL
RA2 1 1 I/O TTL
RA3 2 2 I/O TTL
RA4/T0CKI 3 3 I/O ST RA4 can also be the clock input to the Timer0 timer/counter.
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 6 I/O TTL/ST
(2)
RB0 can also be the external interrupt pin.
RB1 7 7 I/O TTL
RB2 8 8 I/O TTL
RB3 9 9 I/O TTL
RB4 10 10 I/O TTL Interrupt on change pin.
RB5 11 11 I/O TTL Interrupt on change pin.
RB6 12 12 I/O TTL/ST
(3)
Interrupt on change pin. Serial programming clock.
RB7 13 13 I/O TTL/ST
(3)
Interrupt on change pin. Serial programming data.
V
SS 5 5 P — Ground reference for logic and I/O pins.
V
DD 14 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 configured in RC oscillator mode and a CMOS input otherwise.
2: This buffer is a Schmitt Trigger input when configured as the external interrupt.
3: This buffer is a Schmitt Trigger input when used in serial programming mode.