5. Each Component Function
70 User’s Manual
* 4003h: WDT counter
W
D6 D5 D4 D3 D2 D1 D0D7
T6 T5 T4 T3 T2 T1 T0T7
Figure 5.11. WDT Counter Port (4003h)
W : Writes watchdog timer count data.
Write watchdog timer counter expiration time
data. The watchdog timer counter clock can
be set to 13 levels within a range of 244.14
µsec through 1sec. The following is an
example time-up setting when the clock is set
to 250msec:
0.5sec → 02h
1sec → 04h
4sec → 10h
8sec → 20h
15sec → 3Ch
30sec → 78h
* 4004h: Event output control
--- --- R/W (Default: XXXX0000b)--- --- WM2 WM1 WM0RESET
D6 D5 D4 D3 D2 D1 D0D7
Figure 5.12. Event Output Control Port (4004h)
Table 5.21. WM2-WM0: Interrupt Output Modes
WM2 WM1 WM0
0 0 0 Inhibit interrupt output when time expires on the WDT.
0 0 1 Output to NMI when time expires on the WDT.
0 1 0 Output to IRQ5 when time expires on the WDT.
0 1 1 Output to IRQ7 when time expires on the WDT.
1 0 0 Output to IRQ9 when time expires on the WDT.
1 0 1 Output to IRQ10 when time expires on the WDT.
1 1 0 Output to IRQ11 when time expires on the WDT.
Interrupt output at occurrence of WDT errors
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