Z16F2800100ZCOG Zilog, Z16F2800100ZCOG Datasheet - Page 255

• Manufacturer Part Number: Z16F2800100ZCOG
• Description: DEV KIT FOR Z16F ZNEO
• Manufacturer: Zilog
• Series: ZNEO™r
• Type: MCUr

Specifications of Z16F2800100ZCOG

• Contents: Evaluation Board, Software and Documentation
• For Use With/related Products: Z16F Series
• For Use With: 269-4661 - KIT ACC ETHERNET SMART CABLE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-4537

Watchdog Timer
Operation
PS022008-0810
WDT Time-out Period (ms)
The Watchdog Timer (WDT) helps protect against corrupt or unreliable software, power
faults, and other system-level problems which places the ZNEO
unsuitable operating states.
The WDT includes the following features:
•
•
•
The WDT is a retriggerable one-shot timer that resets or interrupts the ZNEO Z16F Series
device, when the WDT reaches its terminal count. The WDT uses its own dedicated 
on-chip RC oscillator as its clock source. The WDT 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 is performed by executing the
The
been executed.
To minimize power consumption, the RC oscillator is disabled. The RC oscillator is 
disabled by clearing the
is disabled, the WDT will not operate.
The WDT is a 16-bit reloadable downcounter that uses two 8-bit registers in the ZNEO
CPU register space to set the reload value. The nominal WDT time-out period is given by
the following equation:
where, WDT reload value is the decimal value of the 16-bit value given by {WDTH[7:0],
WDTL[7:0]} and the typical Watchdog Timer RC oscillator frequency is 10 kHz.
Table 119
minimum, default, and maximum WDT reload values.
On-chip RC oscillator.
A selectable time-out response: short reset or system exception.
16-bit programmable time-out value.
WDT_AO
on page 240 provides information on approximate time-out delays for the 
bit enables the WDT to operate all the time, even if a
WDTEN
P R E L I M I N A R Y
bit in the
=
WDT Reload Value
------------------------------------------------- -
WDT
Oscillator Control
instruction or by setting the
10
Register. If the RC oscillator
®
Product Specification
Z16F Series device into
WDT
ZNEO
WDT_AO
instruction has not
Watchdog Timer
Z16F Series
option bit.
239