Z8F64220100ZDA Zilog, Z8F64220100ZDA Datasheet - Page 107

ADAPTER ICE Z8 ENCORE 64K 64LQFP

Z8F64220100ZDA

Manufacturer Part Number
Z8F64220100ZDA
Description
ADAPTER ICE Z8 ENCORE 64K 64LQFP
Manufacturer
Zilog
Datasheets

Specifications of Z8F64220100ZDA

Module/board Type
*
For Use With/related Products
Z8 Encore!™
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
269-3403
Watchdog Timer
Operation
PS019921-0308
The Watchdog Timer (WDT) helps protect against corrupt or unreliable software, power
faults, and other system-level problems which may place the Z8 Encore! XP into unsuit-
able operating states. The features of Watchdog Timer include:
The Watchdog Timer (WDT) is a retriggerable one-shot timer that resets or interrupts the
Z8 Encore! XP
Watchdog Timer uses its own dedicated on-chip RC oscillator as its clock source. The
Watchdog 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 exe-
cuting the WDT instruction or by setting the WDT_AO Option Bit. The WDT_AO bit
enables the Watchdog Timer to operate all the time, even if a WDT instruction has not
been executed.
The Watchdog Timer is a 24-bit reloadable downcounter that uses three 8-bit registers in
the eZ8
given by the following equation:
where the WDT reload value is the decimal value of the 24-bit value given by
{WDTU[7:0], WDTH[7:0], WDTL[7:0]} and the typical Watchdog Timer RC oscillator
frequency is 10 kHz. The Watchdog Timer cannot be refreshed once it reaches
The WDT Reload Value must not be set to values below
information on approximate time-out delays for the minimum and maximum WDT reload
values.
On-chip RC oscillator.
A selectable time-out response.
WDT Time-out response: Reset or interrupt.
24-bit programmable time-out value.
CPU register space to set the reload value. The nominal WDT time-out period is
WDT Time-out Period (ms)
®
F64XX Series devices when the WDT reaches its terminal count. The
=
WDT Reload Value
----------------------------------------------- -
10
Z8 Encore! XP
000004H
Product Specification
.
Table 47
®
F64XX Series
Watchdog Timer
provides
000002H
.
93

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