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Sheet目录3841

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2000 Microchip Technology Inc.

DS30605C-page 33

PIC16C63A/65B/73B/74B

5.3

PORTC and TRISC Registers

PORTC is an 8-bit bi-directional port. Each pin is indi-

vidually configurable as an input or output through the

TRISC register. PORTC is multiplexed with several

peripheral functions (Table 5-5). PORTC pins have

Schmitt Trigger input buffers.

When enabling peripheral functions, care should be

taken in defining TRIS bits for each PORTC pin. Some

peripherals override the TRIS bit to make a pin an out-

put, while other peripherals override the TRIS bit to

make a pin an input. Since the TRIS bit override is in

effect while the peripheral is enabled, read-modify-write

instructions (BSF, BCF, XORWF) with TRISC as des-

tination should be avoided. The user should refer to the

corresponding peripheral section for the correct TRIS

bit settings.

FIGURE 5-5:

PORTC BLOCK DIAGRAM

TABLE 5-5:

PORTC FUNCTIONS

TABLE 5-6:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTC

PORT/PERIPHERAL Select(2)

Data Bus

Port

TRIS

Data Latch

TRIS Latch

RD TRIS

Schmitt

Trigger

Peripheral Data Out

VDD

VSS

Port

Peripheral

OE(3)

Peripheral Input

I/O pin(1)

Note

I/O pins have diode protection to VDD and VSS.

Port/Peripheral select signal selects between port

data and peripheral output.

Peripheral OE (output enable) is only activated if

peripheral select is active.

Name

Bit#

Buffer Type

Function

RC0/T1OSO/T1CKI

bit0

Input/output port pin or Timer1 oscillator output/Timer1 clock input.

RC1/T1OSI/CCP2

bit1

Input/output port pin or Timer1 oscillator input or Capture2 input/Compare2

output/PWM2 output.

RC2/CCP1

bit2

Input/output port pin or Capture1 input/Compare1 output/PWM1 output.

RC3/SCK/SCL

bit3

RC3 can also be the Synchronous Serial Clock for both SPI and I2C modes.

RC4/SDI/SDA

bit4

RC4 can also be the SPI Data In (SPI mode) or Data I/O (I2C mode).

RC5/SDO

bit5

Input/output port pin or Synchronous Serial Port Data output.

RC6/TX/CK

bit6

Input/output port pin or USART Asynchronous Transmit, or USART

Synchronous Clock.

RC7/RX/DT

bit7

Input/output port pin or USART Asynchronous Receive, or USART

Synchronous Data.

Legend: ST = Schmitt Trigger input

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on:

POR,

BOR

Value on

all other

RESETS

07h

PORTC

RC7

RC6

RC5

RC4

RC3

RC2

RC1

RC0

xxxx xxxx

uuuu uuuu

87h

TRISC

PORTC Data Direction register

1111 1111

Legend: x = unknown, u = unchanged

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