PIC16F753 datasheet(39/230 Pages) MICROCHIP

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DS40001709C-page 39

PIC16F753/HV753

5.0

I/O PORTS

Depending on the device selected and peripherals

enabled, there are up to two ports available. In general,

when a peripheral is enabled, that pin may not be used

as a general purpose I/O pin.

Each port has three standard registers for its operation.

These registers are:

• TRISx registers (data direction)

• PORTx registers (reads the levels on the pins of

the device)

• LATx registers (output latch)

Some ports may have one or more of the following

additional registers. These registers are:

• ANSELx (analog select)

• WPUx (weak pull-up)

• SLRCONx registers (slew rate)

The Data Latch (LATx registers) is useful for read-

modify-write operations on the values that the I/O pins

are driving.

A write operation to the LATx register has the same

affect as a write to the corresponding PORTx register.

A read of the LATx register reads the values held in the

I/O PORT latches, while a read of the PORTx register

reads the actual I/O pin value.

Ports with analog functions also have an ANSELx

power. A simplified model of a generic I/O port, without

the interfaces to other peripherals, is shown in

Figure 5-1.

FIGURE 5-1:

GENERIC I/O PORTA

OPERATION

EXAMPLE 5-1:

INITIALIZING PORTA

Write LATA

Data Register

I/O pin

Read PORTA

Write PORTA

TRISA

Read LATA

Data Bus

To peripherals

ANSELA

VDD

VSS

; This code example illustrates

; initializing the PORTA register. The

; other ports are initialized in the same

; manner.

BANKSEL

PORTA

;

CLRF

PORTA

;Init PORTA

BANKSEL

LATA

;Data Latch

CLRF

LATA

;

BANKSEL

ANSELA

;

CLRF

ANSELA

;digital I/O

BANKSEL

TRISA

;

MOVLW

B'00111000'

;Set RA<5:3> as inputs

MOVWF

TRISA

;and set RA<2:0> as

;outputs

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