Table
Address of |
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register (2E) | Attribute | Description | |
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Read/Write | Value (2F) |
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| and |
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| description |
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87 (hex) | Write this address to I/O address | ||
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| port 2E (hex) twice to unlock the | |
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| W83627HF | |
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07 (hex) | write | Write 08 (hex) to select register of | |
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| watchdog timer. | |
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30 (hex) | write | Write 01 (hex) to enable the function of | |
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| the watchdog timer. Disabled is set as | |
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| default. |
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F5 (hex) | write | Set seconds or minutes as units for | |
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| the timer. | |
Write 0 to bit 3: set second as counting unit. [default]
Write 1 to bit 3: set minute as counting unit
F6 (hex) | write | 0: stop timer [default]01~FF (hex): The |
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| amount of the count, in seconds or |
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| minutes, depends on the value set in |
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| register F5 (hex). This number |
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| decides how long the watchdog timer |
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| waits for strobe before generating an |
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| interrupt or reset signal. Writing a new |
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| value to this register can reset the |
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| timer to count with the new value. |
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F7 (hex) | rd/wr | Bit 6: Write 1 to enable keyboard to |
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| reset the timer, 0 to disable.[default] |
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| Bit 5: Write 1 to generate a timeout |
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| signal immediately and automatically |
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| return to 0. [default=0] Bit 4: Read |
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| status of watchdog timer, 1 means |
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| timer is "time out". |
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AA (hex) | Write this address to I/O port 2E (hex) | |
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| to lock the watchdog timer.2 |
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Appendix A Programming the Watchdog Timer | 55 |
