NJU3504FA1 View Datasheet(PDF) - Japan Radio Corporation

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NJU3504FA1

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3504

(2) PROGRAMMABLE INPUT/OUTPUT PORT OPERATION

a. The output operation example

PB0 and PB1 of PORTB output “H”, and PB2 and PB3 of PORTB output “L”.

:

SRPC

;

LDI

Y,0

; Peripheral table is

LDI

A,%0001

;

set as the table1

TAP

;

LDI

Y,2

;PHY18 is pointed

LDI

A,%0011

;"0011" is stored into Accumulator

TAP

;Data in Accumulator is transmitted to PHY18

; (PORTB output register)

LDI

Y,13

;PHY29 is pointed

LDI

A,%0010

;"0001" is stored into Accumulator

TAP

;Data in Accumulator is transmitted to PHY29

:

PORTB is

set as the output

b. The input operation example

Accumulator gets the input data from PORTB.

:

SRPC

;

LDI

Y,0

; Peripheral table is

LDI

A,%0001

; set as the table1

TAP

;

LDI

Y,13

;PHY29 is pointed

LDI

A,%0000

;"0000" is stored into Accumulator

PORTB is

set as the input

TAP

;Data in Accumulator is transferred to PHY29

LDI

Y,2

;PHY18 is pointed

TPA

;The input data from PHY18 is transferred to Accumulator

:

The signal from PB0 terminal is stored into the LSB of Accumulator, the signal from PB1 terminal is stored

into the b1 of Accumulator, the signal from PB2 terminal is stored into the b2 of Accumulator, and the signal

from PB3 terminal is stored into the b3 of Accumulator.

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