PIC16F1933-ESLASHP datasheet(98/418 Pages) MICROCHIP

98 / 418 page

PIC16F193X/LF193X

DS41364A-page 96

Preliminary

6.5

PORTD and TRISD Registers

PORTD(1) is a 8-bit wide, bidirectional port. The

corresponding

data

direction

TRISD

(Register 6-16). 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 6-4 shows how to initialize PORTD.

Reading the PORTD register (Register 6-14) 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.

The TRISD register (Register 6-16) 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’.

EXAMPLE 6-4:

INITIALIZING PORTD

Note 1: PORTD is available on PIC16F1936 and

PIC16F1938 only.

BANKSEL PORTD

;

CLRF

PORTD

;Init PORTD

BANKSEL ANSELD

CLRF

ANSELD

;Make PORTD digital

BANKSEL TRISD

;

MOVLW

B‘00001100’

;Set RD<3:2> as inputs

MOVWF

TRISD

;and set RD<7:4,1:0>

;as outputs

PORTD: PORTD REGISTER(1)

R/W-x/u

RD7

RD6

RD5

RD4

RD3

RD2

RD1

RD0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = bit is unchanged

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 7-0

RD<7:0>: PORTD General Purpose I/O Pin bits

= Port pin is > VIH

= Port pin is < VIL

Note 1:

PORTD is not implemented on PIC16F1933/1936/1938 devices, read as ‘0’.

LATD: PORTD DATA LATCH REGISTER

R/W-x/u

LATD7

LATD6

LATD5

LATD4

LATD3

LATD2

LATD1

LATD0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = bit is unchanged

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 7-0

LATD<7:0>: PORTD Output Latch Value bits(1,2)

Note 1:

Writes to PORTD are actually written to corresponding LATD register. Reads from PORTD register is

return of actual I/O pin values.

PORTD implemented on PIC16F1934/1937/1939/PIC16LF1934/1937/1939 devices only.

PIC16F1933-E/P Datasheet(PDF) 98 Page - Microchip Technology

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