Advantech AIMB-221 manual Cmos clear JCMOS1, Watchdog timer output JWDT1

1.9.2CMOS clear (JCMOS1)

The AIMB-221 motherboard contains a jumper that can erase CMOS data and reset the system BIOS information. Normally this jumper should be set with pins 1-2 closed. If you want to reset the CMOS data, set JCMOS1 to 2-3 closed for just a few seconds, and then move the jumper back to 1-2 closed. This procedure will reset the CMOS to its default setting.

Table 1.1: CMOS (JCMOS1)

Function Jumper Setting

* Keep CMOS data

1-2 closed

Clear CMOS data

2-3 closed

*default setting

1.9.3Watchdog timer output (JWDT1)

The AIMB-221 contains a watchdog timer that will reset the CPU or send a signal to IRQ11 in the event the CPU stops processing. This feature means the AIMB-221 will recover from a software failure or an EMI problem. The JWDT1 jumper settings con- trol the outcome of what the computer will do in the event the watchdog timer is tripped.

Table 1.2: Watchdog timer output (JWDT1)

Function Jumper Setting

IRQE

1-2 closed

*Reset

2-3 closed

* default setting

Note! The interrupt output of the watchdog timer is a low level signal. It will be held low until the watchdog timer is reset.

Chapter 1 Hardware Configuration

9 AIMB-221 User Manual