PIC12C671 datasheet(9/129 Pages) MICROCHIP

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DS30561B-page 9

PIC12C67X

TABLE 3-1:

PIC12C67X PINOUT DESCRIPTION

Name

DIP Pin #

I/O/P

Type

Buffer

Type

Description

GP0/AN0

I/O

TTL/ST Bi-directional I/O port/serial programming data/analog input 0.

Can be software programmed for internal weak pull-up and

interrupt-on-pin change. This buffer is a Schmitt Trigger input

when used in serial programming mode.

GP1/AN1/VREF

I/O

TTL/ST Bi-directional I/O port/serial programming clock/analog input 1/

voltage reference. Can be software programmed for internal

weak pull-up and interrupt-on-pin change. This buffer is a

Schmitt Trigger input when used in serial programming mode.

GP2/T0CKI/AN2/INT

I/O

Bi-directional I/O port/analog input 2. Can be configured as

T0CKI or external interrupt.

GP3/MCLR/VPP

TTL/ST Input port/master clear (reset) input/programming voltage

input. When configured as MCLR, this pin is an active low

reset to the device. Voltage on MCLR/VPP must not exceed

VDD during normal device operation. Can be software pro-

grammed for internal weak pull-up and interrupt-on-pin

change. Weak pull-up always on if configured as MCLR . This

buffer is Schmitt Trigger when in MCLR mode.

GP4/OSC2/AN3/CLKOUT

I/O

TTL

Bi-directional I/O port/oscillator crystal output/analog input 3.

Connections to crystal or resonator in crystal oscillator mode

(HS, XT and LP modes only, GPIO in other modes). In EXTRC

and INTRC modes, the pin output can be configured to CLK-

OUT, which has 1/4 the frequency of OSC1 and denotes the

instruction cycle rate.

GP5/OSC1/CLKIN

I/O

TTL/ST Bi-directional IO port/oscillator crystal input/external clock

source input (GPIO in INTRC mode only, OSC1 in all other

oscillator modes). Schmitt trigger input for EXTRC oscillator

mode.

VDD

—

Positive supply for logic and I/O pins.

VSS

—

Ground reference 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.

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