PIC16C73A-04SLASHP datasheet(13/288 Pages) MICROCHIP

13 / 288 page

DS30390E-page 13

PIC16C7X

TABLE 3-1:

PIC16C72 PINOUT DESCRIPTION

Pin Name

DIP

Pin#

SSOP

Pin#

SOIC

Pin#

I/O/P

Type

Buffer

Type

Description

OSC1/CLKIN

ST/CMOS(3) Oscillator crystal input/external clock source input.

OSC2/CLKOUT

—

Oscillator crystal output. Connects to crystal or resonator in

crystal oscillator mode. In RC mode, the OSC2 pin outputs

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

the instruction cycle rate.

MCLR/VPP

I/P

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

I/O

TTL

RA0 can also be analog input0

RA1/AN1

I/O

TTL

RA1 can also be analog input1

RA2/AN2

I/O

TTL

RA2 can also be analog input2

RA3/AN3/VREF

I/O

TTL

RA3 can also be analog input3 or analog reference voltage

RA4/T0CKI

I/O

RA4 can also be the clock input to the Timer0 module.

Output is open drain type.

RA5/SS/AN4

I/O

TTL

RA5 can also be analog input4 or the slave select for the

synchronous serial port.

PORTB is a bi-directional I/O port. PORTB can be software

programmed for internal weak pull-up on all inputs.

RB0/INT

I/O

TTL/ST(1)

RB0 can also be the external interrupt pin.

RB1

I/O

TTL

RB2

I/O

TTL

RB3

I/O

TTL

RB4

I/O

TTL

Interrupt on change pin.

RB5

I/O

TTL

Interrupt on change pin.

RB6

I/O

TTL/ST(2)

Interrupt on change pin. Serial programming clock.

RB7

I/O

TTL/ST(2)

Interrupt on change pin. Serial programming data.

PORTC is a bi-directional I/O port.

RC0/T1OSO/T1CKI

I/O

RC0 can also be the Timer1 oscillator output or Timer1

clock input.

RC1/T1OSI

I/O

RC1 can also be the Timer1 oscillator input.

RC2/CCP1

I/O

RC2 can also be the Capture1 input/Compare1 output/

PWM1 output.

RC3/SCK/SCL

I/O

RC3 can also be the synchronous serial clock input/output

for both SPI and I2C modes.

RC4/SDI/SDA

I/O

RC4 can also be the SPI Data In (SPI mode) or

data I/O (I2C mode).

RC5/SDO

I/O

RC5 can also be the SPI Data Out (SPI mode).

RC6

I/O

RC7

I/O

VSS

8, 19

—

Ground reference for logic and I/O pins.

VDD

—

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 as the external interrupt.

This buffer is a Schmitt Trigger input when used in serial programming mode.

This buffer is a Schmitt Trigger input when conﬁgured in RC oscillator mode and a CMOS input otherwise.

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