MDT2020FF Datasheet, PDF (5/16 Pages) Micon Design Technology Corporation – 8-bit micro-controller

(9) TMR (Time Mode Register)
MDT2020(FF)
Bit
2—0
3
4
5
Symbol
PS2—0
PSC
TCE
TCS
Function
Prescaler Value
RTCC rate
WDT rate
000
1:2
1:1
001
1:4
1:2
010
1:8
1:4
011
1 : 16
1:8
100
1 : 32
1 : 16
101
1 : 64
1 : 32
110
1 : 128
1 : 64
111
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
(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
HFXT Oscillator
XTAL Oscillator
LFXT Oscillator
Oscillator Start-up Time
150 μs,20ms,40ms,80ms
20 ms,40ms,80ms
20ms,40 ms,80ms
40ms,80 ms
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
2007/8 VER 1.5