PIC16F882-ISLASHSS datasheet(55/338 Pages) MICROCHIP

55 / 338 page

 2006-2012 Microchip Technology Inc.

DS41291G-page 55

PIC16F882/883/884/886/887

3.5

PORTC and TRISC Registers

PORTC is a 8-bit wide, bidirectional port. The

corresponding data direction register is TRISC

(Register 3-10). Setting a TRISC bit (= 1) will make the

corresponding PORTC pin an input (i.e., put the

corresponding output driver in a High-Impedance mode).

Clearing a TRISC bit (= 0) will make the corresponding

PORTC pin an output (i.e., enable the output driver and

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

Example 3-4 shows how to initialize PORTC.

Reading the PORTC register (Register 3-9) reads the

status of the pins, whereas writing to it will write to the

PORT latch. All write operations are read-modify-write

operations. Therefore, a write to a port implies that the

port pins are read, this value is modified and then written

to the PORT data latch.

The TRISC register (Register 3-10) controls the PORTC

pin output drivers, even when they are being used as

analog inputs. The user should ensure the bits in the

TRISC register are maintained set when using them as

analog inputs. I/O pins configured as analog input always

read ‘0’.

EXAMPLE 3-4:

INITIALIZING PORTC

BANKSEL PORTC

;

CLRF

PORTC

;Init PORTC

BANKSEL TRISC

;

MOVLW

B‘00001100’ ;Set RC<3:2> as inputs

MOVWF

TRISC

;and set RC<7:4,1:0>

;as outputs

PORTC: PORTC REGISTER

R/W-x

RC7

RC6

RC5

RC4

RC3

RC2

RC1

RC0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

RC<7:0>: PORTC General Purpose I/O Pin bit

1 = Port pin is > VIH

0 = Port pin is < VIL

TRISC: PORTC TRI-STATE REGISTER

R/W-1

R/W-1(1)

TRISC7

TRISC6

TRISC5

TRISC4

TRISC3

TRISC2

TRISC1

TRISC0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

TRISC<7:0>: PORTC Tri-State Control bit

1 = PORTC pin configured as an input (tri-stated)

0 = PORTC pin configured as an output

Note 1:

TRISC<1:0> always reads ‘1’ in LP Oscillator mode.

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