APU428 View Datasheet(PDF) - APLUS INTEGRATED CIRCUITS

Part Name

Description

Manufacturer

APU428

4-Bit Micro-controller With LCD Driver

APLUS INTEGRATED CIRCUITS 

APU428

Predivider

The predivider is a 15-sage counter that uses PH0 as clock source. The output of T-FF is changed when the

input signal is changed from H to L. PH11~15 are reset to L when PLC 100H instruction is executed,

power-on reset or external reset is used. When PH14 is changed from H to L, the HALT release signal is

generated.

Alarm/frequency/melody

There is an 8-bit programmable counter and an 8-bit envelope control for alarm, frequency or melody output

from BZ/BZB.

The frequency counter can use software to select 1/2 duty, 1/3 duty,1/4 duty drive modes.

Frequency

1/2 Duty Frequency

1/3 Duty Frequency

1/4 Duty Frequency

INT function

The INT pin can be selected by mask option as pull-high/pull-low or none, and as a rising edge/falling edge

trigger.

Watchdog Timer

The watchdog timer automatically generates a device reset when it overflows. The interval of overflow is

8/64/512 x PH10 (set by mask option). You can use software to enable and disable this function. The

watchdog enable flag will be disabled by power on reset or reset pin reset condition, but cannot be disabled

by watchdog reset itself.

HALT function

The HALT instruction disables all clocks except the predivider, timer, frequency counter, PWM, EL-light

generator and chattering clock in order to minimize the operating current.

STOP function

The STOP instruction disables all clocks to minimize the standby current, so only two external factors (INT,

IOA/IOC) can release the stop condition.

Instruction Table

Instruction

NOP

LCT Lz, Ry

Machine Code

0000 0000 0000 0000

0000 001Z ZZZZ YYYY

LCB Lz, Ry

0000 010Z ZZZZ YYYY

LCP Lz, Ry

0000 011Z ZZZZ YYYY

LCD Lz, @HL

0000 100Z ZZZZ 0000

OPA Rx

0000 1010 0XXX XXXX

OPAS Rx, D

0000 1011 DXXX XXXX

OPB Rx

0000 1100 0XXX XXXX

Function

No Operation

Lz Чʳ { 7SEG Чʳ Ry}

Lz Чʳ { 7SEG Чʳ Ry}

Lz Чʳ Ry , AC

Lz Чʳ T@HL

Port(A) Чʳ Rx

A1, 2, 3, 4 Чʳ Rx0, Rx1, D, Pulse

Port(B) Чʳ Rx

Flag/Remark

Preliminary

12

Ver. 0.0

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