APU428

Features:

Low power dissipation
Powerful instruction set (148 instructions)
       Binary addition, subtraction, BCD
       adjustment, logical operation in direct
       addressing mode and index addressing mode
       Single-bit manipulation (set, reset, decision for branch)
       Various conditional branches
       16 working registers and manipulation
       LCD driver data transfer
       Look-up table
       Programmable option
       System clock selection
Memory capacity
       Instruction ROM capacity 2048 x 16 bits
       Index ROM capacity 256 x 8 bits
       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)
Input/output ports
       Port IOA 4 pins (with internal pull-low,chattering clock, MUX with CX, RR, RT, RH/SEG 37~40 by mask option)
       Port IOB 4 pins (MUX with ELC, ELP, BZB,BZ/SEG41, 42 by mask option)
       Port IOC 4 pins (with internal pull-low,low-level hold, chattering clock, MUX option with AN1~4 by mask option)
       Port IOD 4 pins (MUX with PWM1,2/SEG33~36 by mask option)
       8-level subroutine nesting
       Interrupt function
       External factor 2 (INT pin & port IOA, IOCinput)
       Internal factor 4 (predivider, 2 timers & RFC)
Built-in EL-light driver, alarm, frequency or melody generator (MUX with IOB/ SEG41, 42)
Built-in R to F converter circuit (MUX with IOA/SEG37~40)
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 port PWM 2 pins (MUX with SEG35, 36)
       Port ADC 4 pins (MUX with IOC)
2 6-bit programmable timers with programmable clock source
      Watchdog timer
LCD/LED driver output
      42 LCD/LED driver outputs (up to 168 LCD segments are drivable)
      Mask option is used to select static, 1/2 bias1/2 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
      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
      Mask option is used to select SEG28~32 as P open-drain DC outputs
      Single instruction stops all segments that are either in LCD or LED
      Built-in voltage doubler, halver, tripler charge pump circuit
Dual clock operation
HALT function
Stop function


Pinout




Specifications

Name	Symbol	Rating	Unit
Maximum Supply Voltage	VDD1	-0.3~+5.5	V
	VDD2	-0.3~+5.5	V
	VDD3	-0.3~+8.5	V
Maximum Input Voltage	V1N1	-0.3 to VDD1/2+0.3	V
Maximum Output Voltage	VOUT1	-0.3 to VDD1/2+0.3	V
	VOUT2	-0.3 to VDD3+0.3	V
Maximum Operating Temperature	TOPG	0 to +70
Maximum Storage Temperature	TSTG	-25 to +125

Description

APU428 is an embedded high-performance 4-bit microcomputer with an LCD/LED driver. APU428 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 LCDdata 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.