PIC16C71 datasheet(55/337 Pages) MICROCHIP

55 / 337 page

DS30234D-page 55

PIC16C6X

5.3

PORTC and TRISC Register

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

individually 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

destination should be avoided. The user should refer to

the corresponding peripheral section for the correct

TRIS bit settings.

EXAMPLE 5-3:

INITIALIZING PORTC

BCF

STATUS, RP0

;

BCF

STATUS, RP1

; PIC16C66/67 only

CLRF

PORTC

; Initialize PORTC by

; clearing output

; data latches

BSF

STATUS, RP0

; Select Bank 1

MOVLW

0xCF

; Value used to

; initialize data

; direction

MOVWF

TRISC

; Set RC<3:0> as inputs

; RC<5:4> as outputs

; RC<7:6> as inputs

Applicable Devices

61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67

FIGURE 5-6:

PORTC BLOCK DIAGRAM

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 1:

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.

TABLE 5-5:

PORTC FUNCTIONS FOR PIC16C62/64

Name

Bit# Buffer Type Function

RC0/T1OSI/T1CKI

bit0

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

RC1/T1OSO

bit1

Input/output port pin or Timer1 oscillator 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

bit6

Input/output port pin

RC7

bit7

Input/output port pin

Legend: ST = Schmitt Trigger input

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