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PIC16F873 Datasheet(PDF) 7 Page - Microchip Technology |
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PIC16F873 Datasheet(HTML) 7 Page - Microchip Technology |
7 / 218 page 1998-2013 Microchip Technology Inc. DS30292D-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 9 9 I ST/CMOS(3) Oscillator crystal input/external clock source input. OSC2/CLKOUT 10 10 O — 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 1 1 I/P ST 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 2 2 I/O TTL RA0 can also be analog input0. RA1/AN1 3 3 I/O TTL RA1 can also be analog input1. RA2/AN2/VREF- 4 4 I/O TTL RA2 can also be analog input2 or negative analog reference voltage. RA3/AN3/VREF+ 5 5 I/O TTL RA3 can also be analog input3 or positive analog reference voltage. RA4/T0CKI 6 6 I/O ST RA4 can also be the clock input to the Timer0 module. Output is open drain type. RA5/SS/AN4 7 7 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 21 21 I/O TTL/ST(1) RB0 can also be the external interrupt pin. RB1 22 22 I/O TTL RB2 23 23 I/O TTL RB3/PGM 24 24 I/O TTL RB3 can also be the low voltage programming input. RB4 25 25 I/O TTL Interrupt-on-change pin. RB5 26 26 I/O TTL Interrupt-on-change pin. RB6/PGC 27 27 I/O TTL/ST(2) Interrupt-on-change pin or In-Circuit Debugger pin. Serial programming clock. RB7/PGD 28 28 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 11 11 I/O ST RC0 can also be the Timer1 oscillator output or Timer1 clock input. RC1/T1OSI/CCP2 12 12 I/O ST RC1 can also be the Timer1 oscillator input or Capture2 input/Compare2 output/PWM2 output. RC2/CCP1 13 13 I/O ST RC2 can also be the Capture1 input/Compare1 output/ PWM1 output. RC3/SCK/SCL 14 14 I/O ST RC3 can also be the synchronous serial clock input/output for both SPI and I2C modes. RC4/SDI/SDA 15 15 I/O ST RC4 can also be the SPI Data In (SPI mode) or data I/O (I2C mode). RC5/SDO 16 16 I/O ST RC5 can also be the SPI Data Out (SPI mode). RC6/TX/CK 17 17 I/O ST RC6 can also be the USART Asynchronous Transmit or Synchronous Clock. RC7/RX/DT 18 18 I/O ST RC7 can also be the USART Asynchronous Receive or Synchronous Data. VSS 8, 19 8, 19 P — Ground reference for logic and I/O pins. VDD 20 20 P — 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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