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 :
u fully cmos static design
u 8-bit data bus
u on chip rom size : 2 k words
u internal ram size : 80 bytes
(72 general purpose, 8 special registers)
u 36 single word instructions
u 14-bit instructions
u 2-level stacks
u operating voltage : 2.3 v ~ 5.5 v
u operating frequency : 0 ~ 20 mhz
u the most fast execution time is 200 ns
under 20 mhz in all single cycle
instructions except the branch
instruction.
u addressing modes include direct,
indirect and relative addressing modes
u power-on reset
u power edge-detector reset
u sleep mode for power saving
u 4 oscillator start-up time :
150 ms, 20 ms, 40 ms, 80 ms
u 8-bit real time clock/counter(rtcc) with
8-bit programmable prescaler
u 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
u on-chip rc oscillator based watchdog
timer(wdt) can be operated freely
u 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.