PIC16F1526 datasheet(134/354 Pages) MICROCHIP

134 / 354 page

PIC16(L)F1526/27

DS41458A-page 134

Preliminary

 2011 Microchip Technology Inc.

12.7

PORTF Registers

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

corresponding data direction register is TRISF

(Register 12-7). Setting a TRISF bit (= 1) will make the

corresponding PORTF pin an input (i.e., put the

corresponding output driver in a High-Impedance mode).

Clearing a TRISF bit (= 0) will make the corresponding

PORTF 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 PORTF register (Register 12-6) 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 (LATF).

The TRISF register (Register 12-7) controls the PORTF

pin output drivers, even when they are being used as

analog inputs. The user should ensure the bits in the

TRISF register are maintained set when using them as

analog inputs. I/O pins configured as analog input always

read ‘0’.

12.7.1

ANSELF REGISTER

The ANSELF register (Register 12-9) is used to

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

Setting the appropriate ANSELF 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 ANSELF bits has no effect on digital out-

put functions. A pin with TRIS clear and ANSELF 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.

12.7.2

PORTE FUNCTIONS AND OUTPUT

PRIORITIES

Each PORTF pin is multiplexed with other functions. The

pins, their combined functions and their output priorities

are shown in Table 12-13.

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 12-13.

Note:

The ANSELF 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 12-13: PORTF OUTPUT PRIORITY

Pin Name

Function Priority(1)

RF0

VCAP(2)

RF0

RF1

RF2

RF3

RF4

RF5

RF6

RF7

Note 1:

Priority listed from highest to lowest.

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