The HD63705VO is an &-bit CMOS single chip microcom• puter unit (MCU) which includes 4k bytes of EPROM and is object code compatible with the HD6305VO. HD63701VO contains a CPU, clock oscillator, 4k bytes of EPROM, 192 bytes of RAM, 31 parallel 1/0 pins, two timers and a serial communication interface (SCI). Inaddition to CMOS technology, it provides power saving STOP, WAIT and STANDBY modes, further reducing its already low power consumption. The HD63705VO is available in a hermetically sealed 40- pin ceramic package with a glass window. This glass window allows for programming and EPROM erasure in the same sway as 27256 type EPROM.