B&B Electronics PC Watchdog Timer Card ATRWDT Manual do Utilizador descarregar pdf (Página 16)

P104-WDG-CSM User Manual

A/DC Channel #3 (BASE+B)

Read 8-bit dedicated analog input (light sensor). Dark = FF, Max Light = 00

82c54 Out 2 (BASE+C)

Read this address to select the 16MHz clock rate, write to select 2MHz.

This determines the width of the watchdog reset output when not connected to the

motherboard reset input.

TTL & Isolated Output (BASE+D)

Write (any value) to turn on isolated (transistor) output #1 and LED1 sink.

Read to turn off (default state).

TTL & Isolated Output (BASE+E)

Write (any value) to turn on isolated (transistor) output #2 and LED2 sink.

Read to turn off (default state).

The CONTROL register (BASE+F) enables/disables six circuits:

bit 0 = watchdog timer enable/disable

bit 1 = isolated output #1 (also LED drive #1) is on/off

bit 2 = isolated output #2 (also LED drive #2) is on/off

bit 3 = isolated input #2 is allowed to generate reset

bit 4 = 32 bit timer clock rate is 2MHz if this bit is set or 16MHz if this bit is zero

bit 5 = reset button enable (set HIGH)

bit 6 = fan stop / start (toggle HIGH then LOW)

bit 7 = global IRQ enable/disable

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B&B Electronics PC Watchdog Timer Card ATRWDT Manual do Utilizador Página 16