![VMIC VMICPCI-7611 Скачать руководство пользователя страница 53](http://html1.mh-extra.com/html/vmic/vmicpci-7611/vmicpci-7611_product-manual_1043196053.webp)
52
4
VMICPCI-7611 Product Manual
Watchdog Timer
The VMICPCI-7611 utilizes a Dallas DS1284 Watchdog Timekeeping Controller as its
Watchdog Timer. The device provides a Time of Day feature and a Watchdog Alarm.
The Time of Day feature found within the DS1284 device is explained in this section.
The actual Time of Day registers used by the VMICPCI-7611 are located at the
standard PC/AT I/O address. The Time of Day feature in the DS1284 Watchdog
Timer is available for use by the user at their discretion.
The Watchdog Timer provides a Watchdog alarm window and interval timing
between 0.01 and 99.99 seconds. If enabled, and if jumper E7 pins 1 and 2 are loaded,
the Watchdog alarm will reset the CPU to a known state if not accessed during the
alarm window.
Figure 4-2 shows a generalized block diagram of how the Watchdog Timer is used in
the VMICPCI-7611. The Watchdog Timer registers are I/O-mapped at address $500
through $50D. Table 4-6 on page 53 shows the address, content and the range of each
Watchdog Register.
Figure 4-2 Watchdog Alarm Block
Watchdog
Timer
CPU
Jumper E7
INT
Reset
1
2
3
To SERR# or NMI
Pin#
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com