APU428 Datasheet, PDF(1/18 Page) Aplus Intergrated Circuits – 4-Bit Micro-controller With LCD Driver

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APU428 Datasheet, PDF (1/18 Pages) Aplus Intergrated Circuits – 4-Bit Micro-controller With LCD Driver

APU428

4-Bit Micro-controller With LCD Driver

Features

y Low power dissipation

y Powerful instruction set (148 instructions)

Î«Ê³ Binary addition, subtraction, BCD

adjustment, logical operation in direct

addressing mode and index

Î«Ê³ addressing mode

Î«Ê³ Single-bit manipulation (set, reset, decision

for branch)

Î«Ê³ Various conditional branches

Î«Ê³ 16 working registers and manipulation

Î«Ê³ LCD driver data transfer

Î«Ê³ Look-up table

Î«Ê³ Programmable option

Î«Ê³ System clock selection

y Memory capacity

Î«Ê³ Instruction ROM capacity 2048 x 16 bits

Î«Ê³ Index ROM capacity 256 x 8 bits

Î«Ê³ Internal RAM capacity 256 x 4 bits

(low-address 128 nibbles can be accessed

by direct addressing, full-range 256 nibbles

can be accessed by index addressing)

y Input/output ports

Î«Ê³ Port IOA 4 pins (with internal pull-low,

chattering clock, MUX with CX, RR, RT, RH/

SEG 37~40 by mask option)

Î«Ê³ Port IOB 4 pins (MUX with ELC, ELP, BZB,

BZ/SEG41, 42 by mask option)

Î«Ê³ Port IOC 4 pins (with internal pull-low,

low-level hold, chattering clock, MUX option

with AN1~4 by mask option)

Î«Ê³ Port IOD 4 pins (MUX with PWM1,

2/SEG33~36 by mask option)

y 8-level subroutine nesting

y Interrupt function

Î«Ê³ External factor 2 (INT pin & port IOA, IOC

input)

Î«Ê³ Internal factor 4 (predivider, 2 timers & RFC)

y Built-in EL-light driver, alarm, frequency or

melody generator (MUX with IOB/ SEG41, 42)

y Built-in R to F converter circuit (MUX with

IOA/SEG37~40)

y Built-in comparator, 6/8-bit PWM output, 4-bit

D/A converter, low-battery detector; this

structure can be used as a 4/6/8-bit full range

ADC

Î«Ê³ Port PWM 2 pins (MUX with SEG35, 36)

Î«Ê³ Port ADC 4 pins (MUX with IOC)

y 2 6-bit programmable timers with programmable

clock source

y Watchdog timer

y LCD/LED driver output

Î«Ê³ 42 LCD/LED driver outputs (up to 168 LCD

segments are drivable)

Î«Ê³ Mask option is used to select static, 1/2 bias

1/2 duty, 1/2 bias 1/3 duty, 1/2 bias 1/4 duty,

1/3 bias 1/3 duty and 1/3 bias 1/4 duty drive

modes of the LCD panel

Î«Ê³ Mask option is used to select DC output,

and static, 1/2 duty, 1/3 duty and 1/4 duty

drive modes of the LED panel

Î«Ê³ Mask option is used to select SEG28~32 as

P open-drain DC outputs

Î«Ê³ Single instruction stops all segments that

are either in LCD or LED

y Built-in voltage doubler, halver, tripler charge

pump circuit

y Dual clock operation

y HALT function

y Stop function

General Description

APU428 is an embedded high-performance 4-bit

microcomputer with an LCD/LED driver. It contains

all the necessary functions in a single chip: 4-bit

parallel processing ALU, ROM, RAM, I/O ports, timer,

clock generator, dual clock, ADC, RFC, alarm,

EL-light, LCD driver, look-up table and watchdog

timer. The instruction set consists of 148 instructions

which include nibble operation, manipulation,

various conditional branch instructions and LCD

data transfer instructions which are powerful and

easy to follow.

The HALT function stops any internal operations other

than the oscillator, divider and LCD driver in order to

minimize the power dissipation.

The stop function stops all clocks in the chip.

Preliminary

Ver. 0.0

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