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Sheet目录3828

41页 42页 43页 44页 [45页]46页 47页 48页 49页

2002 Microchip Technology Inc.

DS30325B-page 35

PIC16F7X

4.3

PORTC and the TRISC Register

PORTC is an 8-bit wide, bi-directional 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 Hi-Impedance 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

effect

while

the

peripheral

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

2: Port/Peripheral select signal selects between port data

and peripheral output.

3: Peripheral OE (output enable) is only activated if

peripheral select is active.

I/O

pin(1)

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

Synchronous Clock.

RC7/RX/DT

bit7

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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