101-0391 Rabbit Semiconductor, 101-0391 Datasheet - Page 169

• Manufacturer Part Number: 101-0391
• Description: CARD DIGITAL IO 8/8 SNKNG SR9220
• Manufacturer: Rabbit Semiconductor

Specifications of 101-0391

• Accessory Type: Smart Star Digital I/O Card
• For Use With/related Products: SR9220
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

C.2.4 Reset Generator
The CPU Card uses a reset generator, U4, to reset the Rabbit 2000 microprocessor when
the voltage drops below the voltage necessary for reliable operation. The reset occurs
between 4.50 V and 4.75 V, typically 4.63 V. The reset can be initiated either externally or
by a watchdog timeout (
User’s Manual
NOTE: The Dynamic C function chkWDTO is not able to detect whether a watchdog
timeout has occurred on the SR9100 series of CPU cards. The GCSR status bits are
read and stored by the BIOS, and the reset status bit would normally change once a
reset has occurred. However, since WDTOUT is tied to the reset generator, a watchdog
timeout forces a hardware reset, followed by the BIOS reading and storing the status
bits corresponding to power-up or reset.
WDTOUT
Figure C-3. Reset Generator
) on the Rabbit 2000 microprocessor.
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W
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