Aaeon EMB-A50M Manual de usuario descargar pdf (Pagina 40)

Mini-ITX EMB-A50M

Appendix A Programming the Watchdog Timer A-4

WatchDog Timer Configuration Registers

07h 71h R/W 00h Watch Dog Timer Control Register

07h 72h R/W 20h Watch Dog Timer Configuration Register

07h 73h R/W 38h Watch Dog Timer Time-out Value (LSB) Register

07h 74h R/W 00h Watch Dog Timer Time-out Value (MSB) Register

Configure Control (Index=02h)

This register is write only. Its values are not sticky; that is to say, a

hardware reset will automatically clear the bits, and does not

require the software to clear them.

Bit Description

7-2 Reserved

Returns to the Wait for Key state. This bit is used when the

configuration sequence is completed.

Resets all logical devices and restores configuration

registers to their power-on states.

Watch Dog Timer Control Register (Index=71h, Default=00h)

Bit Description

7 WDT is reset upon a CIR interrupt.

6 WDT is reset upon a KBC (Mouse) interrupt.

5 WDT is reset upon a KBC (Keyboard) interrupt.

4 Reserved

3-2 Reserved

Force Time-out

This bit is self-cleared.

0 WDT Status

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 63 64

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Aaeon EMB-A50M Manual de usuario Pagina 40