Specifications

Watchdog Timer
OVERVIEW
The primary function of the watchdog timer is to monitor ZT 8832
operation and to take corrective action if the ZT 8832 fails to function
as programmed. The watchdog timer includes two stages. The first-
stage timeout generates a non-maskable interrupt. The second-stage
timeout generates a local reset. The major features of the watchdog
timer are listed below.
• Enabled and disabled through jumper selection
• Armed and strobed through software control
• Increased programming flexibility with two stages
ZT 8832 SPECIFICS
The watchdog timer must be jumper selected before it is operational.
If the watchdog timer is selected, the most significant bit of the
parallel ports becomes dedicated to the watchdog timer and cannot be
used for general purpose I/O.
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