Datasheet

© 2007 Microchip Technology Inc. DS41213D-page 9
PIC16F5X
TABLE 2-1: PIC16F54 PINOUT DESCRIPTION
Name Function
Input
Type
Output
Type
Description
RA0 RA0 TTL CMOS Bidirectional I/O pin
RA1 RA1 TTL CMOS Bidirectional I/O pin
RA2 RA2 TTL CMOS Bidirectional I/O pin
RA3 RA3 TTL CMOS Bidirectional I/O pin
RB0 RB0 TTL CMOS Bidirectional I/O pin
RB1 RB1 TTL CMOS Bidirectional I/O pin
RB2 RB2 TTL CMOS Bidirectional I/O pin
RB3 RB3 TTL CMOS Bidirectional I/O pin
RB4 RB4 TTL CMOS Bidirectional I/O pin
RB5 RB5 TTL CMOS Bidirectional I/O pin
RB6/ICSPCLK RB6 TTL CMOS Bidirectional I/O pin
ICSPCLK ST — Serial Programming Clock
RB7/ICSPDAT RB7 TTL CMOS Bidirectional I/O pin
ICSPDAT ST CMOS Serial Programming I/O
T0CKI T0CKI ST — Clock input to Timer0. Must be tied to V
SS or VDD, if not in use, to
reduce current consumption.
MCLR/VPP MCLR ST — Active-low Reset to device. Voltage on the MCLR/VPP pin must
not exceed V
DD to avoid unintended entering of Programming
mode.
VPP HV —
Programming voltage input
OSC1/CLKIN OSC1 XTAL — Oscillator crystal input
CLKIN ST — External clock source input
OSC2/CLKOUT OSC2 — XTAL Oscillator crystal output. Connects to crystal or resonator in
Crystal Oscillator mode.
CLKOUT — CMOS In RC mode, OSC2 pin can output CLKOUT, which has 1/4 the
frequency of OSC1.
V
DD VDD Power — Positive supply for logic and I/O pins
VSS VSS Power — Ground reference for logic and I/O pins
Legend: I = input I/O = input/output CMOS = CMOS output
O = output — = Not Used XTAL = Crystal input/output
ST = Schmitt Trigger input TTL = TTL input HV = High Voltage