PIC18C Reference Manual

DS39504A-page 4-8

 2000 Microchip Technology Inc.

P

P

Analog Ground

BA0

O

—

System bus byte address 0

CANRX

I

ST

CAN bus receive pin

CANTX0

O

—

CAN bus transmit

CANTX1

O

—

CAN bus complimentary transmit or CAN bus bit time clock

CCP1

I/O

ST

Capture1 input/Compare1 output/PWM1 output

CCP2

I/O

ST

Capture2 input/Compare2 output/PWM2 output.

CK

I/O

ST

USART Synchronous Clock, always associated with TX pin function

(See related TX, RX, DT)

CLKI

I

ST/CMOS

External clock source input. Always associated with pin function

OSC1. (See related OSC1/CLKIN, OSC2/CLKOUT pins)

CLKO

O

—

Oscillator crystal output. Connects to crystal or resonator in crystal

oscillator mode. In RC mode, OSC2 pin outputs CLKOUT which has

1/4 the frequency of OSC1, and denotes the instruction cycle rate.

Always associated with OSC2 pin function. (See related OSC2,

OSC1)

CMPA

O

—

Comparator A output

CMPB

O

—

Comparator B output

CS

I

TTL

Chip select control for parallel slave port (See related RD and WR)

O

Analog

Comparator voltage reference output

DT

I/O

ST

USART Synchronous Data. Always associated RX pin function. (See

related RX, TX, CK)

Table 4-1:

I/O Descriptions (Continued)

Pin Name

Pin

Type

Buffer

Type

Description

Legend: TTL = TTL-compatible input

CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels

O = output

PU = Weak internal pull-up

I = input

Analog = Analog input or output

P = Power