Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 85
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Z8FMC04100
Manufacturer Part Number
Z8FMC04100
Description
Z8 Encore-R Motor Control Flash MCUs
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z8FMC04100.pdf
(402 pages)
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Watch-Dog Timer
PS024604-1005
Operation
The Watch-Dog Timer (WDT) helps protect against corrupted or unreliable software and
other system-level problems which may place the Z8FMC16100 Series Flash MCU into
unsuitable operating states. The Watch-Dog Timer includes the following features:
•
•
•
The Watch-Dog Timer (WDT) is a retriggerable one-shot timer that resets or interrupts the
Z8FMC16100 Series Flash MCU when the WDT reaches its terminal count. The Watch-
Dog Timer uses its own dedicated on-chip RC oscillator as its clock source. The Watch-
Dog Timer has only two modes of operation—on and off. Once enabled, it always counts
and must be refreshed to prevent a time-out. An enable can be performed by executing the
WDT instruction or by setting the
Dog Timer to operate all the time, even if a WDT instruction has not been executed.
To minimize power consumption, the RC oscillator can be disabled. The RC oscillator is
disabled by clearing the
is disabled, the WDT will not operate.
The Watch-Dog Timer is a 16-bit reloadable downcounter that uses two 8-bit registers in
the eZ8 CPU register space to set the reload value. The nominal WDT time-out period is
calculated by the following equation:
where the WDT reload value is assigned by {
Watch-Dog Timer RC oscillator frequency is 10 KHz. The user should consider system
requirements when selecting the time out delay. Table 39 provides information on approx-
imate time-out delays for the default and maximum WDT reload values.
WDT Time-Out Period (ms) =
On-chip RC oscillator
A selectable time-out response: Reset or System Exception
16-bit programmable time-out value
WDTEN
P R E L I M I N A R Y
bit in the Oscillator Control Register. If the RC oscillator
WDT Reload Value
WDT_AO
10
Option Bit. The
WDTH[7:0]
Z8FMC16100 Series Flash MCU
,
WDTL[7:0]
WDT_AO
Product Specification
bit enables the Watch-
} and the typical
Operation
63
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