MDT2020(DF)
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.
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Addressing modes include direct,
indirect and relative addressing modes
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u
u
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Power-on Reset
Power Edge-detector Reset
Sleep mode for power saving
4 oscillator start-up time :
150
µs,
20 ms, 40 ms, 80 ms
2. Features
The followings are some of the features on
the hardware and software :
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Fully CMOS static design
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8-bit data bus
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On chip ROM size : 2 K words
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Internal RAM size : 80 bytes
(72 general purpose, 8 special registers)
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36 single word instructions
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14-bit instructions
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2-level stacks
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Operating voltage : 2.3 V ~ 5.5 V
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Operating frequency : 0 ~ 20 MHz
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The most fast execution time is 200 ns
under 20 MHz in all single cycle
instructions
except
the
branch
instruction.
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8-bit real time clock/counter(RTCC) with
8-bit programmable prescaler
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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
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On-chip RC oscillator based Watchdog
Timer(WDT) can be operated freely
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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.
This specification are subject to be changed without notice. Any latest information please preview
http;//www.mdtic.com.tw
P. 1
2005/6
VER 1.3
MDT2020(DF)
6. Memory Map
(A) Register Map
Address
00
01
02
03
04
05
06
07
08~0F
10~1F
30~3F
50~5F
70~7F
Description
Indirect Addressing Register
RTCC
PC
STATUS
MSR
Port A
Port B
Port C
Internal RAM, General Purpose Register
Internal Memory Select Register
Internal Memory Select Register
Internal Memory Select Register
Internal Memory Select Register
(1) IAR ( Indirect Address Register) : R0
(2) RTCC (Real Time Counter/Counter Register) : R1
(3) PC (Program Counter) : R2
Write PC, CALL --- always 0
LJUMP, JUMP, LCALL --- from instruction word
RTWI, RET --- from STACK
A10
A9
A8
A7~A0
Write PC, JUMP, CALL --- from STATUS b6 b5
LJUMP, LCALL --- from instruction word
RTWI, RET --- from STACK
Write PC --- from ALU
LJUMP, JUMP, LCALL, CALL --- from instruction word
RTWI, RET --- from STACK
This specification are subject to be changed without notice. Any latest information please preview
http;//www.mdtic.com.tw
P. 2
2005/6
VER 1.3
MDT2020(DF)
(9) TMR (Time Mode Register)
Bit
Symbol
Prescaler Value
Function
RTCC rate
WDT rate
0 0 0
1:2
1:1
0 0 1
1:4
1:2
0 1 0
1:8
1:4
0 1 1
1 : 16
1:8
1 0 0
1 : 32
1 : 16
1 0 1
1 : 64
1 : 32
1 1 0
1 : 128
1 : 64
1 1 1
1 : 256
1 : 128
Prescaler assignment bit :
0
—
RTCC
1
—
Watchdog Timer
RTCC signal Edge :
0
—
Increment on low-to-high transition on RTCC pin
1
—
Increment on high-to-low transition on RTCC pin
RTCC signal set :
0
—
Internal instruction cycle clock
1
—
Transition on RTCC pin
2—0
PS2—0
3
PSC
4
TCE
5
TCS
(10) CPIO A, CPIO B, CPIO C (Control Port I/O Mode Register)
The CPIO register is “write-only”
＝“0”,
I/O pin in output mode;
＝“1”,
I/O pin in input mode.
(11) EPROM Option by Writer Programming:
Oscillator Type
RC
Oscillator
Oscillator Start-up Time
150
µs,20ms,40ms,80ms
20 ms,40ms,80ms
20ms,40 ms,80ms
80 ms
HFXT Oscillator
XTAL Oscillator
LFXT Oscillator
Watchdog Timer control
Watchdog timer disable all the time
Watchdog timer enable all the time
This specification are subject to be changed without notice. Any latest information please preview
http;//www.mdtic.com.tw
P. 4
2005/6
VER 1.3
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