PIC16F1526 datasheet(128/354 Pages) MICROCHIP

128 / 354 page

PIC16(L)F1526/27

DS41458A-page 128

Preliminary

 2011 Microchip Technology Inc.

12.5

PORTD Registers

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

corresponding data direction register is TRISD

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

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

corresponding output driver in a High-Impedance mode).

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

PORTD 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 PORTD 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 (LATD).

The TRISD register (Register 12-7) controls the PORTD

pin output drivers, even when they are being used as

analog inputs. The user should ensure the bits in the

TRISD register are maintained set when using them as

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

read ‘0’.

12.5.1

ANSELD REGISTER

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

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

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

put functions. A pin with TRIS clear and ANSELD 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.

12.5.2

PORTD FUNCTIONS AND OUTPUT

PRIORITIES

Each PORTD pin is multiplexed with other functions. The

pins, their combined functions and their output priorities

are shown in Table 12-9.

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 12-9.

Note:

The ANSELD 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 12-9:

PORTD OUTPUT PRIORITY

Pin Name

Function Priority(1)

RD0

RD1

RD2

RD3

RD4

SDO2

RD4

RD5

SDA2

RD5(2)

RD6

SCL2

SCK2

RD6(2)

RD7

Note 1:

Priority listed from highest to lowest.

RD5 and RD6 read the I2C ST input when

I2C mode is enabled.

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