MDT2020(DF)

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P. 4

2005/6

VER 1.3

(9) TMR (Time Mode Register)

Bit

Symbol

Function

Prescaler Value

RTCC rate

WDT rate

2—0

PS2—0

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

1 : 2

1 : 4

1 : 8

1 : 16

1 : 32

1 : 64

1 : 128

1 : 256

1 : 1

1 : 2

1 : 4

1 : 8

1 : 16

1 : 32

1 : 64

1 : 128

3

PSC

Prescaler assignment bit :

0 — RTCC

1 — Watchdog Timer

4

TCE

RTCC signal Edge :

0 — Increment on low-to-high transition on RTCC pin

1 — Increment on high-to-low transition on RTCC pin

5

TCS

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

Oscillator Start-up Time

RC

Oscillator

150

µs,20ms,40ms,80ms

HFXT Oscillator

20 ms,40ms,80ms

XTAL Oscillator

20ms,40 ms,80ms

LFXT Oscillator

80 ms

Watchdog Timer control

Watchdog timer disable all the time

Watchdog timer enable all the time