P12C508 datasheet(9/84 Pages) MICROCHIP

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Advance Information

DS40139A-page 9

PIC12C5XX

TABLE 3-1:

PIC12C5XX PINOUT DESCRIPTION

Name

DIP

Pin #

SOIC

Pin #

I/O/P

Type

Buffer

Type

Description

GP0

I/O

TTL/ST Bi-directional I/O port/ serial programming clock. Can

be software programmed for internal weak pull-up and

wake-up from SLEEP on pin change. This buffer is a

Schmitt Trigger input when used in serial programming

mode.

GP1

I/O

TTL/ST Bi-directional I/O port/ serial programming data. Can

be software programmed for internal weak pull-up and

wake-up from SLEEP on pin change. This buffer is a

Schmitt Trigger input when used in serial programming

mode.

GP2/T0CKI

I/O

Bi-directional I/O port. Can be conﬁgured as T0CKI.

GP3/MCLR/VPP

TTL

Input port/master clear (reset) input/programming volt-

age 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 programmed for internal weak pull-up

and wake-up from SLEEP on pin change. Weak pull-

up always on if conﬁgured as MCLR

GP4/OSC2

I/O

TTL

Bi-directional I/O port/oscillator crystal output. Con-

nections to crystal or resonator in crystal oscillator

mode (XT and LP modes only, GPIO in other modes).

GP5/OSC1/CLKIN

I/O

TTL/ST Bidirectional IO port oscillator crystal input/external

clock source input (GPIO in Internal RC mode only,

OSC1 in all other oscillator modes).

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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