CME136686LX Hardware Manual - RTD Embedded Technologies ...
CME136686LX Hardware Manual - RTD Embedded Technologies ...
CME136686LX Hardware Manual - RTD Embedded Technologies ...
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Register Description<br />
The Advanced Watchdog Timer has a Setup Register and a Runtime Register. The Setup Register is set by the<br />
BIOS, and can be adjusted by entering the BIOS Setup Utility, and going to “Advanced/Miscellaneous<br />
Configuration”. The Setup Register may also be read by the driver to determine if the Watchdog is enabled, and<br />
the interrupt and base address that it is using.<br />
Note Enabling the watchdog timer in the BIOS does not actually arm it. The watchdog timer can be<br />
armed by accessing I/O address 465h, as explained below.<br />
Table 50<br />
Advanced Watchdog Setup Register 46Dh<br />
D7 D6 D5 D4 D3 D2 D1 D0<br />
Reserved<br />
WDT_IRQ<br />
Select Interrupt for WDT<br />
000=Disabled<br />
001 = IRQ5<br />
010 = IRQ7<br />
011 = IRQ10<br />
100 = IRQ11<br />
101 = IRQ12<br />
110 = IRQ3<br />
111 = IRQ6<br />
Reg_Enable<br />
0=Watchdog timer is disabled and<br />
Runtime Register will not appear<br />
in I/O map<br />
1=Watchdog Timer is enabled.<br />
Runtime Register will appear in<br />
I/O map<br />
Table 51<br />
Advanced Watchdog Runtime Register 465h<br />
D7 D6 D5 D4 D3 D2 D1 D0<br />
WDT_Active<br />
0=Watchdog<br />
timer is<br />
disabled.<br />
1=Watchdog is<br />
armed and<br />
can generate<br />
resets and<br />
interrupts.<br />
WDT_IRQ_Ena<br />
0=Watchdog<br />
interrupt is<br />
disabled.<br />
1=Watchdog<br />
interrupt is<br />
enabled.<br />
Reserved<br />
WDT_IRQ_Time<br />
Select Interrupt<br />
time for<br />
WDT<br />
00=0.25s<br />
01 = 0.50s<br />
10 = 0.75s<br />
11 = 1.00s<br />
WDT_RST_Time<br />
Select Reset time<br />
for WDT<br />
00=1.55-2.10s<br />
01 = 0.50s<br />
10 = 0.75s<br />
11 = 1.00s<br />
Reading the Runtime Register also refreshes the watchdog timer.<br />
78 <strong>CME136686LX</strong> cpuModule BDM-610000065 Rev C
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