PIC10LF322T-EMCSQTP datasheet(75/210 Pages) MICROCHIP

75 / 210 page

 2011 Microchip Technology Inc.

Preliminary

DS41585A-page 75

PIC10(L)F320/322

10.0

I/O PORT

Depending on which peripherals are enabled, some or

all of the pins may not be available as general purpose

I/O. In general, when a peripheral is enabled on a port

pin, that pin cannot be used as a general purpose

output. However, the pin can still be read.

PORTA has three standard registers for its operation.

These registers are:

• TRISA register (data direction)

• PORTA register (reads the levels on the pins of

the device)

• LATA register (output latch)

Some ports may have one or more of the following

additional registers. These registers are:

• ANSELA (analog select)

• WPUA (weak pull-up)

The Data Latch (LATA register) is useful for read-

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

are driving.

A write operation to the LATA register has the same

effect as a write to the corresponding PORTA register.

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

the I/O PORT latches, while a read of the PORTA

Ports that support analog inputs have an associated

ANSELA register. When an ANSEL bit is set, the digital

input buffer associated with that bit is disabled.

Disabling the input buffer prevents analog signal levels

on the pin between a logic high and low from causing

excessive current in the logic input circuitry. A

simplified model of a generic I/O port, without the

interfaces to other peripherals, is shown in Figure 10-1.

FIGURE 10-1:

I/O PORT OPERATION

EXAMPLE 10-1:

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

;not required on devices with 1 Bank of SFRs

CLRF

PORTA

;Init PORTA

BANKSEL

LATA

;not required on devices with 1 Bank of SFRs

CLRF

LATA

;

BANKSEL

ANSELA

;not required on devices with 1 Bank of SFRs

CLRF

ANSELA

;digital I/O

BANKSEL

TRISA

;not required on devices with 1 Bank of SFRs

MOVLW

B'00000011'

;Set RA<1:0> as inputs

MOVWF

TRISA

;and set RA<2:3> as

;outputs

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