8.4
Watchdog Timer
The VP 110/01x board includes a hardware Watchdog timer which can be used by the operating
software to monitor the normal operation of the system. The timer is enabled by a board switch
(see Figure 8-1) and controlled by software. Once enabled it must be restarted at regular
intervals. If it is not restarted for a period of approximately 1 second, the timer will expire and
cause a Non-Maskable Interrupt or reset to the local processor. See Section 8.4.3 for further
details of watchdog timer operation.
The watchdog timer facility is provided by a Maxim MAX705 power-on reset supervisor chip and
additional hardware.
8-6
VP 110/01x
Additional Local I/O Functions
Switch 4 - Watchdog Timer
OFF - Enabled
ON - Disabled
ON
OFF
1
2
3
4
Figure 8-1 Watchdog Timer Switch
Содержание VP 110/01 Series
Страница 18: ...This page has been left intentionally blank 1 6 VP 110 01x Introduction and Overview ...
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Страница 122: ...This page has been left intentionally blank 11 28 VP 110 01x VSA Mode Diagnostics ...
Страница 150: ...This page has been left intentionally blank B 8 VP 110 01x Breakout Modules ...