Datasheet

PIC16F688
DS41203E-page 6 © 2009 Microchip Technology Inc.
TABLE 1-1: PIC16F688 PINOUT DESCRIPTION
Name Function
Input
Type
Output
Type
Description
RA0/AN0/C1IN+/ICSPDAT/ULPWU RA0 TTL CMOS PORTA I/O w/prog pull-up and interrupt-on-change
AN0 AN — A/D Channel 0 input
C1IN+ AN — Comparator 1 input
ICSPDAT TTL CMOS Serial Programming Data I/O
ULPWU AN — Ultra Low-Power Wake-up input
RA1/AN1/C1IN-/V
REF/ICSPCLK RA1 TTL CMOS PORTA I/O w/prog pull-up and interrupt-on-change
AN1 AN — A/D Channel 1 input
C1IN- AN — Comparator 1 input
V
REF AN — External Voltage Reference for A/D
ICSPCLK ST — Serial Programming Clock
RA2/AN2/T0CKI/INT/C1OUT RA2 ST CMOS PORTA I/O w/prog pull-up and interrupt-on-change
AN2 AN — A/D Channel 2 input
T0CKI ST — Timer0 clock input
INT ST — External Interrupt
C1OUT — CMOS Comparator 1 output
RA3/MCLR
/VPP RA3 TTL — PORTA input with interrupt-on-change
MCLR
ST — Master Clear w/internal pull-up
V
PP HV — Programming voltage
RA4/AN3/T1G
/OSC2/CLKOUT RA4 TTL CMOS PORTA I/O w/prog pull-up and interrupt-on-change
AN3 AN — A/D Channel 3 input
T1G
ST — Timer1 gate
OSC2 — XTAL Crystal/Resonator
CLKOUT — CMOS F
OSC/4 output
RA5/T1CKI/OSC1/CLKIN
RA5 TTL CMOS PORTA I/O w/prog pull-up and interrupt-on-change
T1CKI ST — Timer1 clock
OSC1 XTAL — Crystal/Resonator
CLKIN ST — External clock input/RC oscillator connection
RC0/AN4/C2IN+ RC0 TTL CMOS PORTC I/O
AN4 AN — A/D Channel 4 input
C2IN+ AN Comparator 2 input
RC1/AN5/C2IN- RC1 TTL CMOS PORTC I/O
AN5 AN — A/D Channel 5 input
C2IN- AN Comparator 2 input
RC2/AN6 RC2 TTL CMOS PORTC I/O
AN6 AN — A/D Channel 6 input
RC3/AN7 RC3 TTL CMOS PORTC I/O
AN7 AN — A/D Channel 7 input
RC4/C2OUT/TX/CK RC4 TTL CMOS PORTC I/O
C2OUT — CMOS Comparator 2 output
TX — CMOS USART asynchronous output
CK ST CMOS USART asynchronous clock
RC5/RX/DT RC5 TTL CMOS Port C I/O
RX ST CMOS USART asynchronous input
DT ST CMOS USART asynchronous data
V
SS VSS Power — Ground reference
V
DD VDD Power — Positive supply
Legend: AN = Analog input or output CMOS = CMOS compatible input or output OC = Open collector output
TTL = TTL compatible input ST = Schmitt Trigger input with CMOS levels
HV = High Voltage XTAL = Crystal