PIC16F1507-ESLASHSS. datasheet(105/278 Pages) MICROCHIP

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DS40001586D-page 105

PIC16(L)F1507

11.7

PORTC Registers

11.7.1

DATA REGISTER

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

corresponding data direction register is TRISC

(Register 11-13). Setting a TRISC bit (= 1) will make

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

the output driver). 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 11-1 shows how to

initialize an I/O port.

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

11.7.2

DIRECTION CONTROL

The TRISC register (Register 11-13) 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’.

11.7.3

ANALOG CONTROL

The ANSELC register (Register 11-15) 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.

11.7.4

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 11-8.

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 11-8:

PORTC OUTPUT PRIORITY

Pin Name

Function Priority(1)

RC0

CLC2

RC0

RC1

NCO1(2)

PWM4

RC1

RC2

RC3

PWM2

RC3

RC4

CWG1B

RC4

RC5

CWG1A

CLC1(3)

PWM1

RC5

RC6

NCO1(3)

RC6

RC7

Note 1:

Priority listed from highest to lowest.

Default pin (see APFCON register).

Alternate pin (see APFCON register).

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