mdt10p509，p509 1. general description this eprom-based 8-bit micro-controller uses a fully static cmos technology process to achieve higher speed and smaller size with the low power consumption and high noise immunity. on chip memory includes 1k words of rom, and 41 bytes of static ram. 2. features the followings are some of the features on the hardware and software : fully coms static design 8-bit data bus on chip eprom size : 1 k words internal ram size : 41 bytes 36 single word instructions 14-bit instructions 2-level stacks operating voltage : 2.5v ~ 5.0v the most fast execution time is 500 ns under 8mhz in all single cycle instructions except the branch instruction addressing modes include direct, indirect and relative addressing modes power-on reset power edge-detector reset sleep mode for power saving intrc－internal 4 mhz rc oscillator intrc－internal 8 mhz rc oscillator 2 oscillator start-up time can be selected by programming option: 20ms, 150us 8-bit real time clock/counter(rtcc) with 8-bit programma ble prescaler on-chip rc oscillator based watchdog timer(wdt) wake-up from sleep on pin change 3. applications the application areas of this p509 range from appliance motor control and high speed automotive to low power remote transmitters/receivers, small instruments, toy, automobile and pc peripheral …etc.