PIC16F1934-ESLASHML datasheet(139/508 Pages) MICROCHIP

139 / 508 page

 2009 Microchip Technology Inc.

Preliminary

DS41364D-page 139

PIC16F193X/LF193X

12.4

PORTC Registers

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

corresponding data direction register is TRISC

(Register 12-12). 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 12-3 shows how to initialize PORTC.

Reading the PORTC register (Register 12-11) 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 (LATC).

The TRISC register (Register 12-12) 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 12-3:

INITIALIZING PORTC

12.4.1

PORTC FUNCTIONS AND OUTPUT

PRIORITIES

Each PORTC pin is multiplexed with other functions. The

pins, their combined functions and their output priorities

are briefly described here. For additional information,

refer to the appropriate section in this data sheet.

When multiple outputs are enabled, the actual pin

control goes to the peripheral with the lowest number in

the following lists.

Analog input and some digital input functions are not

included in the list below. These input functions can

remain active when the pin is configured as an output.

Certain digital input functions override other port

functions and are included in the priority list.

RC0

T1OSO (Timer1 Oscillator)

CCP2/P2B

RC0

RC1

T1OSI (Timer1 Oscillator)

CCP2/P2A

RC1

RC2

SEG3 (LCD)

CCP1/P1A

RC2

RC3

SEG6 (LCD)

SCL (MSSP)

SCK (MSSP)

RC3

RC4

SEG11 (LCD)

SDA (MSSP)

RC4

RC5

SEG10 (LCD)

SDO (MSSP)

RC5

RC6

SEG9 (LCD)

TX (EUSART)

CK (EUSART)

CCP3/P3A, 28-pin only

RC6

RC7

SEG8 (LCD)

DT (EUSART)

CCP3/P3B, 28 pin only

RC7

BANKSEL

PORTC

;

CLRF

PORTC

;Init PORTC

BANKSEL

LATC

;Data Latch

CLRF

LATC

;

BANKSEL

ANSELC

;

CLRF

ANSELC

;digital I/O

BANKSEL

TRISC

;

MOVLW

B'11110000' ;Set RC<7:4> as inputs

MOVWF

TRISC

;and set RC<3:0> as

;outputs

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