PIC17C44 datasheet(12/241 Pages) MICROCHIP

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PIC17C4X

DS30412C-page 12

TABLE 3-1:

PINOUT DESCRIPTIONS

Name

DIP

No.

PLCC

No.

QFP

No.

I/O/P

Type

Buffer

Type

Description

OSC1/CLKIN

Oscillator input in crystal/resonator or RC oscillator mode.

External clock input in external clock mode.

OSC2/CLKOUT

—

Oscillator output. Connects to crystal or resonator in crystal

oscillator mode. In RC oscillator or external clock modes

OSC2 pin outputs CLKOUT which has one fourth the fre-

quency of OSC1 and denotes the instruction cycle rate.

MCLR/VPP

I/P

Master clear (reset) input/Programming Voltage (VPP) input.

This is the active low reset input to the chip.

PORTA is a bi-directional I/O Port except for RA0 and RA1

which are input only.

RA0/INT

RA0/INT can also be selected as an external interrupt

input. Interrupt can be conﬁgured to be on positive or

negative edge.

RA1/T0CKI

RA1/T0CKI can also be selected as an external interrupt

input, and the interrupt can be conﬁgured to be on posi-

tive or negative edge. RA1/T0CKI can also be selected

to be the clock input to the Timer0 timer/counter.

RA2

I/O

High voltage, high current, open drain input/output port

pins.

RA3

I/O

High voltage, high current, open drain input/output port

pins.

RA4/RX/DT

I/O

RA4/RX/DT can also be selected as the USART (SCI)

Asynchronous Receive or USART (SCI) Synchronous

Data.

RA5/TX/CK

I/O

RA5/TX/CK can also be selected as the USART (SCI)

Asynchronous Transmit or USART (SCI) Synchronous

Clock.

PORTB is a bi-directional I/O Port with software conﬁgurable

weak pull-ups.

RB0/CAP1

I/O

RB0/CAP1 can also be the CAP1 input pin.

RB1/CAP2

I/O

RB1/CAP2 can also be the CAP2 input pin.

RB2/PWM1

I/O

RB2/PWM1 can also be the PWM1 output pin.

RB3/PWM2

I/O

RB3/PWM2 can also be the PWM2 output pin.

RB4/TCLK12

I/O

RB4/TCLK12 can also be the external clock input to

Timer1 and Timer2.

RB5/TCLK3

I/O

RB5/TCLK3 can also be the external clock input to

Timer3.

RB6

I/O

RB7

I/O

PORTC is a bi-directional I/O Port.

RC0/AD0

I/O

TTL

This is also the lower half of the 16-bit wide system bus

in microprocessor mode or extended microcontroller

mode. In multiplexed system bus conﬁguration, these

pins are address output as well as data input or output.

RC1/AD1

I/O

TTL

RC2/AD2

I/O

TTL

RC3/AD3

I/O

TTL

RC4/AD4

I/O

TTL

RC5/AD5

I/O

TTL

RC6/AD6

I/O

TTL

RC7/AD7

I/O

TTL

Legend: I = Input only; O = Output only; I/O = Input/Output; P = Power; — = Not Used; TTL = TTL input;

ST = Schmitt Trigger input.

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