PIC16F873T-04E/SO【PDF 208/218 页】IC MCU FLASH 4KX14 EE 28SOIC

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Sheet目录3889

204页 205页 206页 207页 [208页]209页 210页 211页 212页

2001 Microchip Technology Inc.

DS30292C-page 7

PIC16F87X

TABLE 1-1:

PIC16F873 AND PIC16F876 PINOUT DESCRIPTION

Pin Name

DIP

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/VREF-

I/O

TTL

RA2 can also be analog input2 or negative analog

reference voltage.

RA3/AN3/VREF+

I/O

TTL

RA3 can also be analog input3 or positive 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/PGM

I/O

TTL

RB3 can also be the low voltage programming input.

RB4

I/O

TTL

Interrupt-on-change pin.

RB5

I/O

TTL

Interrupt-on-change pin.

RB6/PGC

I/O

TTL/ST(2)

Interrupt-on-change pin or In-Circuit Debugger pin. Serial

programming clock.

RB7/PGD

I/O

TTL/ST(2)

Interrupt-on-change pin or In-Circuit Debugger 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/CCP2

I/O

RC1 can also be the Timer1 oscillator input or Capture2

input/Compare2 output/PWM2 output.

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/TX/CK

I/O

RC6 can also be the USART Asynchronous Transmit or

Synchronous Clock.

RC7/RX/DT

I/O

RC7 can also be the USART Asynchronous Receive or

Synchronous Data.

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.

2: This buffer is a Schmitt Trigger input when used in Serial Programming mode.

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

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