1. general description this eprom-based 8-bit micro-controller uses a fully static cmos design technology combines higher speed and smaller size with the low power and high noise immunity of cmos. on chip memory system includes 2.0 k bytes of rom, and 80 bytes of static ram. 2. features the followings are some of the features on the hardware and software : ? fully cmos static design ? 8-bit data bus ? on chip rom size : 2 k words ? internal ram size : 80 bytes (72 general purpose, 8 special registers) ? 36 single word instructions ? 14-bit instructions ? 2-level stacks ? operating voltage : 2.3 v ~ 6.0 v ? operating frequency : 0 ~ 20 mhz ? the most fast execution time is 200 ns under 20 mhz in all single cycle instructions except the branch instruction. ? addressing modes include direct, indirect and relative addressing modes ? power-on reset (por), only available while ped is disable ? power edge-detector reset ? sleep mode for power saving ? 4 oscillator start-up time : 150 μs, 20 ms, 40 ms, 80 ms ? 8-bit real time clock/counter(rtcc) with 8-bit programmable prescaler ? 4 types of oscillator can be selected by code options : rc－low cost rc oscillator lfxt－low frequency crystal oscillator xtal－standard crystal oscillator hfxt－high frequency crystal oscillator ? on-chip rc oscillator based watchdog timer(wdt) can be operated freely ? 20 i/o pins with their own independent direction control 3. applications the application areas of this mdt2020 range from appliance motor control and high speed automotive to low power remote transmitters/receivers, pointing devices, and telecommunications processors, such as remote controller, small instruments, chargers, toy, automobile and pc peripheral … etc.