PIC16LF1904 Datasheet, PDF(111/288 Page) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

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PIC16LF1904 Datasheet, PDF (111/288 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

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11.4 PORTD Registers

(PIC16LF1904/7 only)

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

corresponding data direction register is TRISD

(Register 11-14). 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 11-1 shows how to initialize an I/O port.

Reading the PORTD register (Register 11-13) 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 11-14) 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 â0â.

PIC16LF1904/6/7

11.4.1

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 11-9.

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 11-9.

TABLE 11-9: PORTD OUTPUT PRIORITY

Pin Name

Function Priority(1)

RD0

RD0

RD1

RD1

RD2

RD2

RD3

RD3

RD4

RD4

RD5

RD5

RD6

RD6

RD7

RD7

Note 1: Priority listed from highest to lowest.

ï£ 2011 Microchip Technology Inc.

Preliminary

DS41569A-page 111

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