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5. Each Component Function
* 4001h (bit4-6): Alarm out output control
D7
D6
D5
---
WD_S1
WD_S0
Figure 5.6. Alarm Out Output Control Port (4001h)
PO2_M
: PO PO2/WDT pin output setting
0
: Set the RAS connector's PO2/WDT(12) signal to PO2 (general-purpose output).
1
: Set the RAS connector's PO2/WDT(12) signal to alarm out.
Table 5.13. WD_S1, WD_S0: Alarm-out Output Status Settings
When power is
WD_S1 WD_S0
turned off
0
0
OFF
1
0
OFF
1
1
OFF
0
1
OFF
* 4002h: WDT control
D7
D6
D5
Figure 5.7. WDT Control Port (4002h)
R
: Cancels WDT stop/alarm.
Read data is undefined.
W : Start and clear the WDT
Write A5h to start and clear the WDT.
* 4003h: WDT counter
D7
D6
D5
T7
T6
T5
Figure 5.8. WDT Counter Port (4003h)
W : Writes watchdog timer count data.
Write watchdog timer counter expiration time data.
→
1sec
→
8sec
→
15sec
→
30sec
* 4004h : Event output control
D7
D6
D5
---
---
---
Figure 5.9. Event Output Control Port (4004h)
104
D4
D3
D2
PO2_M
RESET
PIM2
External alarm output status
When BIOS
starts
OFF
OFF
ON
ON
D4
D3
D2
D4
D3
D2
T4
T3
01h
08h
0Fh
1Eh
D4
D3
D2
---
RESET
WM2
D1
D0
PIM1
PIM0
When
When time
WDT starts
expires on WDT
OFF
ON
ON
OFF
D1
D0
D1
D0
T2
T1
T0
D1
D0
WM1
WM0
R/W (Default: XXXX0000b)
ON
OFF
OFF
ON
R/W
W
R/W (Default: XXXX0000b)
BX710 series User's Manual
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