PIC16F1516 datasheet(122/344 Pages) MICROCHIP

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PIC16(L)F1516/7/8/9

DS41452B-page 122

Preliminary

 2010 Microchip Technology Inc.

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 12-1 shows how to initialize an I/O port.

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’.

12.4.1

ANSELC REGISTER

The ANSELC register (Register 12-14) 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 affect 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.

12.4.2

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 Table 12-7.

Note:

The ANSELC register must be initialized

to configure an analog channel as a digital

input. Pins configured as analog inputs

will read ‘0’.

TABLE 12-7:

PORTC OUTPUT PRIORITY

Pin Name

Function Priority(1)

RC0

SOSCO

RC0

RC1

SOSCI

CCP2

RC1

RC2

CCP1

RC2

RC3

SCL

SCK

RC3(2)

RC4

SDA

RC4(2)

RC5

SDO

RC5

RC6

RC7

Note 1:

Priority listed from highest to lowest.

RC3 and RC4 read the I2C ST input when

I2C mode is enabled.

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