APU428

APU428 4-Bit Micro-controller With LCD Driver Features y Low power dissipation y Powerful instruction set (148 instructions) Ϋʳ Binary addition, subtraction, BCD adjustment, logical operation in direct addressing mode and index Ϋʳ addressing mode Ϋʳ Single-bit manipulation (set, reset, decision for branch) Ϋʳ Various conditional branches Ϋʳ 16 working registers and manipulation Ϋʳ LCD driver data transfer Ϋʳ Look-up table Ϋʳ Programmable option Ϋʳ System clock selection y Memory capacity Ϋʳ Instruction ROM capacity 2048 x 16 bits Ϋʳ Index ROM capacity 256 x 8 bits Ϋʳ 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 Ϋʳ Port IOA 4 pins (with internal pull-low, chattering clock, MUX with CX, RR, RT, RH/ SEG 37~40 by mask option) Ϋʳ Port IOB 4 pins (MUX with ELC, ELP, BZB, BZ/SEG41, 42 by mask option) Ϋʳ Port IOC 4 pins (with internal pull-low, low-level hold, chattering clock, MUX option with AN1~4 by mask option) Ϋʳ Port IOD 4 pins (MUX with PWM1, 2/SEG33~36 by mask option) y 8-level subroutine nesting y Interrupt function Ϋʳ External factor 2 (INT pin & port IOA, IOC input) Ϋʳ 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-ba...