Aaeon EMB-6908T Manual do Utilizador descarregar pdf (Página 50)

Mini-ITX EMB-6908T

Appendix A Programming the Watchdog Timer A-3

There are three steps to complete the configuration setup: (1)

Enter the MB PnP Mode; (2) Modify the data of configuration

registers; (3) Exit the MB PnP Mode. Undesired result may

occur if the MB PnP Mode is not exited normally.

(1) Enter the MB PnP Mode

To enter the MB PnP Mode, four special I/O write operations

are to be performed during Wait for Key state. To ensure the

initial state of the key-check logic, it is necessary to perform

four write operations to the Special Address port (2EH). Two

different enter keys are provided to select configuration ports

(2Eh/2Fh) of the next step.

(2) Modify the Data of the Registers

All configuration registers can be accessed after entering the

MB PnP Mode. Before accessing a selected register, the

content of Index 07h must be changed to the LDN to which

the register belongs, except some Global registers.

(3) Exit the MB PnP Mode

Set bit 1 of the configure control register (Index=02h) to 1 to

exit the MB PnP Mode.

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 65 66

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