PIC16CR74ESLASHSP datasheet(37/172 Pages) MICROCHIP

37 / 172 page

DS21993C-page 35

PIC16CR7X

4.3

PORTC and the TRISC Register

PORTC is an 8-bit wide, bidirectional port. The corre-

sponding data direction register is TRISC. Setting a

TRISC bit (= 1) will make the corresponding PORTC

pin an input (i.e., put the corresponding output driver in

a High-Impendance mode). Clearing a TRISC bit (= 0)

will make the corresponding PORTC pin an output (i.e.,

put the contents of the output latch on the selected pin).

PORTC is multiplexed with several peripheral functions

(Table 4-5). 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

output, 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

destination should be avoided. The user should refer to

the corresponding peripheral section for the correct

TRIS bit settings, and to Section 13.1 “READ-MOD-

IFY-WRITE OPERATIONS” for additional information

on read-modify-write operations.

FIGURE 4-5:

PORTC BLOCK DIAGRAM

(PERIPHERAL OUTPUT

OVERRIDE)

TABLE 4-5:

PORTC FUNCTIONS

TABLE 4-6:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTC

Port/Peripheral Select(2)

Data Bus

WR Port

WR TRIS

RD Port

Data Latch

TRIS Latch

RD TRIS

Schmitt

Trigger

Peripheral Data Out

VDD

VSS

Peripheral

OE(3)

Peripheral Input

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.

I/O

pin(1)

Name

Bit#

Buffer Type

Function

RC0/T1OSO/T1CKI

bit 0

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

RC1/T1OSI/CCP2

bit 1

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

Compare2 output/PWM2 output.

RC2/CCP1

bit 2

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

RC3/SCK/SCL

bit 3

RC3 can also be the synchronous serial clock for both SPI and I2C™

modes.

RC4/SDI/SDA

bit 4

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

RC5/SDO

bit 5

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

RC6/TX/CK

bit 6

Input/output port pin or USART Asynchronous Transmit or

Synchronous Clock.

RC7/RX/DT

bit 7

Input/output port pin or USART Asynchronous Receive or

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 1111 1111

Legend: x = unknown, u = unchanged

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