The DMC42C4008 is a 4-bit single chip microcomputer having 8K bytes ROM and is designed with CMOS silicon gate technology. The DMC42C4008 includes peripherals such as various timers, A/D converter(8ch), serial communication interface(8bit), on-chip oscillator and clock circuit. It provides the hardware features, architectural enhancements and instructions which are necessary to make it a powerful and cost effective controller for applications requiring up to 64K bytes of programmable memory.