PIC16F1933-ESLASHP datasheet(87/418 Pages) MICROCHIP

87 / 418 page

Preliminary

DS41364A-page 85

PIC16F193X/LF193X

6.2

PORTA Registers

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

corresponding

data

direction

TRISA

(Register 6-4). Setting a TRISA bit (= 1) will make the

corresponding PORTA pin an input (i.e., disable the

output driver). Clearing a TRISA bit (= 0) will make the

corresponding PORTA pin an output (i.e., enables

output driver and puts the contents of the output latch

on the selected pin). Example 6-1 shows how to

initialize PORTA.

Reading the PORTA register (Register 6-2) 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 (LATA).

The TRISA register (Register 6-4) controls the PORTA

pin output drivers, even when they are being used as

analog inputs. The user should ensure the bits in the

TRISA register are maintained set when using them as

analog inputs. I/O pins configured as analog input

always read ‘0’.

EXAMPLE 6-1:

INITIALIZING PORTA

Note:

The ANSELA register must be initialized to

configure an analog channel as a digital

input. Pins configured as analog inputs will

read ‘0’.

BANKSEL PORTA

;

CLRF

PORTA

;Init PORTA

BANKSEL LATA

;Data Latch

CLRF

LATA

;

BANKSEL ANSELA

;

CLRF

ANSELA

;digital I/O

BANKSEL TRISA

;

MOVLW

0Ch

;Set RA<3:2> as inputs

MOVWF

TRISA

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

;as outputs

PORTA: PORTA REGISTER

R/W-x/u

RA7

RA6

RA5

RA4

RA3

RA2

RA1

RA0

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

RA<7:0>: PORTA I/O Value bits(1)

Note 1:

Writes to PORTA are actually written to corresponding LATA register. Reads from PORTA register is return

of actual I/O pin values.

LATA: PORTA DATA LATCH REGISTER

R/W-x/u

LATA7

LATA6

LATA5

LATA4

LATA3

LATA2

LATA1

LATA0

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

LATA<7:0>: PORTA Output Latch Value bits(1)

Note 1:

Writes to PORTA are actually written to corresponding LATA register. Reads from PORTA register is return

of actual I/O pin values.

PIC16F1933-E/P Datasheet(PDF) 87 Page - Microchip Technology

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