INTEDG datasheet(136/478 Pages) MICROCHIP

136 / 478 page

PIC16(L)F1946/47

DS41414D-page 136

 2010-2012 Microchip Technology Inc.

12.7

PORTC Registers

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

corresponding data direction register is TRISC

(Register 12-11). 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 12-1 shows how to initialize an I/O port.

Reading the PORTC register (Register 12-10) 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 12-11) 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 inputs

always read ‘0’.

12.7.1

PORTC FUNCTIONS AND OUTPUT

PRIORITIES

Each PORTC pin is multiplexed with other functions. The

pins, their combined functions and their output priorities

are shown in Table 12-7.

When multiple outputs are enabled, the actual pin

control goes to the peripheral with the highest priority.

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.

TABLE 12-7:

PORTC OUTPUT PRIORITY

Pin Name

Function Priority(1)

RC0

T1OSO (Timer1 Oscillator)

SEG40 (ICD)

RC0

RC1

T1OSI (Timer1 Oscillator)

CCP2(2)/P2A(2)

SEG32 (ICD)

RC1

RC2

SEG13 (LCD)

CCP1/P1A

RC2

RC3

SEG17 (LCD)

SCL1 (MSSP1)

SCK1 (MSSP1)

RC3

RC4

SEG16 (LCD)

SDA1 (MSSP1)

RC4

RC5

SEG12 (LCD)

SDO1 (MSSP1)

RC5

RC6

SEG27 (LCD)

TX1 (EUSART1)

CK2 (EUSART1)

RC6

RC7

SEG28 (LCD)

DT1 (EUSART1)

RC7

Note 1: Priority listed from highest to lowest.

Default pin (see APFCON register).

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