PIC16F1459-ESSQTP datasheet(139/418 Pages) MICROCHIP

139 / 418 page

 2012 Microchip Technology Inc.

Preliminary

DS41639A-page 139

PIC16(L)F1454/5/9

12.7

PORTC Registers

12.7.1

DATA REGISTER

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

corresponding data direction register is TRISC

(Register 12-13). 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 12-2 shows how to

initialize an I/O port.

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

12.7.2

DIRECTION CONTROL

The TRISC register (Register 12-13) 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’.

12.7.3

ANALOG CONTROL

The ANSELC register (Register 12-15) is used to

configure the Input mode of an I/O pin to analog.

Setting the appropriate ANSELC bit high will cause all

digital reads on the pin to be read as ‘0’ and allow

analog functions on the pin to operate correctly.

The state of the ANSELC bits has no effect on digital out-

put functions. A pin with TRIS clear and ANSELC set will

still operate as a digital output, but the Input mode will be

analog. This can cause unexpected behavior when exe-

cuting read-modify-write instructions on the affected

port.

12.7.4

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 12-8.

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 output priority list. 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 output priority list.

Note:

The ANSELC bits default to the Analog

mode after Reset. To use any pins as

digital general purpose or peripheral

inputs, the corresponding ANSEL bits

must be initialized to ‘0’ by user software.

TABLE 12-8:

PORTC OUTPUT PRIORITY

Pin Name

Function Priority(1)

RC0

ICSPDAT

SCL(4)

SCK(4)

RC1

ICSPCLK

SDA(4)

SDI(4)

RC1

RC2

DACOUT1

SDO(2)

RC2

RC3

DACOUT2

CLKR(3)

PWM2(2)

RC3

RC4

CWG1B

C1OUT

C2OUT

TX(4)

RC4

RC5

CWG1A

PWM1

RX(4)

RC5

RC6

PWM2(5)

RC6

RC7

SDO(5)

RC7

Note 1: Priority listed from highest to lowest.

Default pin (see APFCON register).

Alternate pin (see APFCON register).

4: PIC16(L)F1454/5 only.

5: PIC16(L)F1455/9 only.

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