ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 123

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

Watchdog Timer
PS027001-0707
The Watchdog Timer (WDT) helps protect against corrupt or unreliable software, power
faults, and other system-level problems which places the CPU into unsuitable operating
states. The eZ80F91 WDT features:
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Figure 25
Four programmable time-out ranges (depending on the WDT clock source). The four
ranges are:
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–
–
–
Three selectable WDT clock sources:
–
–
–
A selectable time-out response: a time-out is configured to generate either a RESET or
a nonmaskable interrupt (NMI)
A WDT time-out RESET indicator flag
03.2–5.20 ms
51.2–83.9 ms
0.50–0.82 sec
2.68–4.00 sec
Internal RC oscillator
System clock
Real-Time Clock source (on-chip 32 kHz crystal oscillator or 50/60 Hz signal)
on page 116 illustrates a block diagram of the Watchdog Timer.
Product Specification
eZ80F91 ASSP
Watchdog Timer
115