Z8F0413HH005EG Zilog, Z8F0413HH005EG Datasheet - Page 99

• Manufacturer Part Number: Z8F0413HH005EG
• Description: IC ENCORE MCU FLASH 4K 20SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F0413HH005EG

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 5MHz
• Connectivity: IrDA, UART/USART
• Peripherals: Brown-out Detect/Reset, LED, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SSOP
• For Use With: 770-1002 - ISP 4PORT ZILOG Z8 ENCORE! MCU269-4643 - KIT DEV Z8 ENCORE XP 28-PIN269-4630 - DEV KIT FOR Z8 ENCORE 8K/4K269-4629 - KIT DEV Z8 ENCORE XP 28-PIN269-4628 - KIT DEV Z8 ENCORE XP 8-PIN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Other names: 269-4108; Z8F0413HH005EG

Watchdog Timer Control Register Definitions
PS024314-0308
Watchdog Timer Reload Unlock Sequence
Watchdog Timer Control Register
WDT Reset in NORMAL Operation
If configured to generate a Reset when a time-out occurs, the Watchdog Timer forces the
device into the System Reset state. The WDT status bit in the Watchdog Timer Control
register is set to 1. For more information on System Reset, see
Recovery
WDT Reset in STOP Mode
If configured to generate a Reset when a time-out 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 Watchdog Timer Control register are set to 1 following WDT time-out in
STOP mode. For more information, see
Writing the unlock sequence to the Watchdog Timer Control Register (WDTCTL) address
unlocks the three Watchdog Timer Reload Byte Registers (WDTU, WDTH, and WDTL)
to allow changes to the time-out period. These write operations to the WDTCTL register
address produce no effect on the bits in the WDTCTL register. The locking mechanism
prevents spurious writes to the Reload registers. The following sequence is required to
unlock the Watchdog Timer Reload Byte Registers (WDTU, WDTH, and WDTL) for
write access.
1. Write
2. Write
3. Write the Watchdog Timer Reload Upper Byte register (WDTU).
4. Write the Watchdog Timer Reload High Byte register (WDTH).
5. Write the Watchdog Timer Reload Low Byte register (WDTL).
All three Watchdog Timer Reload registers must be written in the order just listed. There
must be no other register writes between each of these operations. If a register write
occurs, the lock state machine resets and no further writes can occur unless the sequence is
restarted. The value in the Watchdog Timer Reload registers is loaded into the counter
when the Watchdog Timer is first enabled and every time a
The Watchdog Timer Control (WDTCTL) register is a write-only control register. Writing
the
55H
,
AAH
on page 21.
55H
AAH
unlock sequence to the WDTCTL register address unlocks the three
to the Watchdog Timer Control register (WDTCTL).
to the Watchdog Timer Control register (WDTCTL).
Reset and Stop Mode Recovery
Z8 Encore! XP
WDT
Reset and Stop Mode
Product Specification
instruction is executed.
on page 21.
®
F0823 Series
Watchdog Timer
89