The SD42C4404(4302) is a 4-bit single chip micro-computer having 4K(2K) bytes ROM and is designed with CMOS silicon gate technology. The SD42C4404 includes such peripherals as various timers, A/D converter, serial communication interface, on-chip oscillator and clock circuitry. The high performance CPU and internal peripherals allow flexible & cost effective system design in industrial and home appliances. And the OTP device (42P4404) can shorten system development periods and help the process for software debugging.