z8fmc16100 ZiLOG Semiconductor, z8fmc16100 Datasheet - Page 75

• Manufacturer Part Number: z8fmc16100
• Description: Z8 Encore Motor Control Flash Mcus
• Manufacturer: ZiLOG Semiconductor

PS024611-0408
Watchdog Timer Reload Unlock Sequence
Watchdog Timer Reload High and Low Byte Registers
WDT Reset in Normal Operation
If configured to generate a Reset when a timeout occurs, the WDT forces the device into
the Reset state. The WDT status bit in the
more information on Reset and the
page 21. Following a Reset sequence, the WDT Counter is initialized with its reset value.
WDT Reset in Stop Mode
If enabled in STOP mode and configured to generate a Reset when a timeout occurs and
the device is in STOP mode, the Watchdog Timer initiates a Stop Mode Recovery. Both
the WDT status bit and the STOP bit in the
following WDT timeout in STOP mode. For more information, see
Recovery
Writing the unlock sequence to the Watchdog Timer Reload High (WDTH) register
address unlocks the two Watchdog Timer Reload registers (WDTH and WDTL) to allow
changes to the timeout period. These write operations to the WDTH register address
produce no effect on the bits in the WDTH register. The locking mechanism prevents
spurious writes to the Reload registers. The following sequence is required to unlock the
Watchdog Timer Reload registers (WDTH and WDTL) for write access:
1. Write
2. Write
3. Write the appropriate value to the Watchdog Timer Reload High register (WDTH).
4. Write the appropriate value to the Watchdog Timer Reload Low register (WDTL).
All steps of the Watchdog Timer Reload Unlock sequence must be written in the order
listed above. The value in the Watchdog Timer Reload registers is loaded into the counter
every time a
The Watchdog Timer Reload High and Low Byte (WDTH, WDTL) registers
through
when a
Write to these registers following the unlock sequence sets the appropriate Reload Value.
Reading from these registers returns the current WDT count value.
WDT
Table
on page 21.
55H
AAH
instruction executes. The 16-bit reload value is {WDTH[7:0], WDTL[7:0]}.
WDT
to the Watchdog Timer Reload High register (WDTH).
to the Watchdog Timer Reload High register (WDTH).
41) form the 16-bit reload value that is loaded into the Watchdog Timer
instruction is executed.
WDT
status bit, see
Reset Status and Control Register
Reset Status and Control Register
Watchdog Timer Reload Unlock Sequence
Z8FMC16100 Series Flash MCU
Reset and Stop Mode Recovery
Product Specification
Reset and Stop Mode
is set to 1. For
are set to 1
(Table 40
on
63