PIC16F1933-ESLASHP datasheet(95/418 Pages) MICROCHIP

95 / 418 page

Preliminary

DS41364A-page 93

PIC16F193X/LF193X

6.4

PORTC and TRISC Registers

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

corresponding

data

direction

TRISC

(Register 6-13). 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 6-3 shows how to initialize PORTC.

Reading the PORTC register (Register 6-11) 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 6-13) 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 6-3:

INITIALIZING PORTC

The location of the CCP2 function is controlled by the

CCP2SEL bit in the APFCON register (refer to

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/u

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’

u = bit is unchanged

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 7-0

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

= Port pin is > VIH

= Port pin is < VIL

LATC: PORTC DATA LATCH REGISTER

R/W-x/u

LATC7

LATC6

LATC5

LATC4

LATC3

LATC2

LATC1

LATC0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = bit is unchanged

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 7-0

LATC<7:0>: PORTC Output Latch Value bits(1)

Note 1:

Writes to PORTC are actually written to corresponding LATC register. Reads from PORTC register is

return of actual I/O pin values.

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