Apuls Intergrated Circuits APU428
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.
| Part No. |
APU428 |
| Datasheet |
APU428
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| Manufacturer |
 Apuls Intergrated Circuits |
| Description |
4-Bit Micro-controller With LCD Driver |
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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...
