PIC16F1516 datasheet(125/344 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

Preliminary

DS41452B-page 125

PIC16(L)F1516/7/8/9

12.5

PORTD Registers

(PIC16F1517/1519 only)

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

corresponding data direction register is TRISD

(Register 12-16). 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 12-15) 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 12-16) 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 12-18) 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 affect 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

PORTD has no peripheral outputs, so the PORTD

output has no priority function.

Note:

The ANSELD register must be initialized

to configure an analog channel as a digital

input. Pins configured as analog inputs

will read ‘0’.

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