Table A.1: Watchdog Timer Registers
Address of Register (2E) Attribute
Read/Write | Value (2F) & |
|
| description |
|
87 (hex) | Write this address to I/O address port 2E (hex) | |
|
| twice to unlock the W83627DHG. |
07 (hex) | write | Write 08 (hex) to select register of watchdog timer. |
30 (hex) | write | Write 01 (hex) to enable the function of the watch- |
|
| dog timer. Disabled is set as default. |
F5 (hex) | write | Set seconds or minutes as units for the timer. |
|
| Write 0 to bit 3: set second as counting unit. |
|
| [default] |
|
| Write 1 to bit 3: set minutes as counting unit. |
F6 (hex) | write | 0: stop timer [default] |
|
| 01~FF (hex): The amount of the count, in seconds |
|
| or minutes, depends on the value set in register F5 |
|
| (hex). This number decides how long the watch- |
|
| dog timer waits for strobe before generating an |
|
| interrupt or reset signal. Writing a new value to this |
|
| register can reset the timer to count with the new |
|
| value. |
F7 (hex) | read/write | Bit 7:Write 1 to enable mouse to reset the timer, 0 |
|
| to disable[default]. Bit 6: Write 1 to enable key- |
|
| board to reset the timer, 0 to disable.[default] |
|
| Bit 5: Write 1 to generate a timeout signal immedi- |
|
| ately and automatically return to 0. [default=0] |
|
| Bit 4: Read status of watchdog timer, 1 means |
|
| timer is “timeout”. |
AA (hex) | Write this address to I/O port 2E (hex) to lock the | |
|
| watchdog timer 2. |
64 |
