Digital Watchdog x39 Manuel de service télécharger pdf (Page 68)

BIOS and System Programming

66 VIPA GmbH CP486 ⋅ 00/14

4.3.4 Watchdog (I/O-Address Area 270-277)

The watchdog is deactivated after system startup and after reset, and can be set on and off by means

of software.

The watchdog must be triggered every 1.6 seconds after enabling. This triggering is realized by

programming a flank. If it is not re-triggered within these 1.6 seconds, the watchdog calls a system

reset (depending on CONTROL register bit 0). The watchdog mode can be inquired by software at

any time in the CP-STATUS register.

The watchdog register is responded by I/O address 270H with following values:

watchdog on : load 40H to address 270H

watchdog off : load 50H to address 270H

trigger watchdog: load 60H to address 270H and finally

load 70H to address 270H

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 189 190

Pas de commentaire

Digital Watchdog x39 Manuel de service Page 68