z8fmc16100 ZiLOG Semiconductor, z8fmc16100 Datasheet - Page 74

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

PS024611-0408
Watchdog Timer Refresh
Watchdog Timer Timeout Response
Table 39. Watchdog Timer Approximate Timeout Delays
When first enabled, the WDT is loaded with the value in the Watchdog Timer Reload reg-
isters. The WDT then counts down to
eZ8 CPU. Execution of the
the WDT Reload value stored in the Watchdog Timer Reload registers. Counting resumes
following the reload operation.
When the Z8FMC16100 Series Flash MCU is operating in DEBUG mode (through the
OCD), the WDT is continuously refreshed to prevent spurious WDT timeouts.
The WDT times out when the counter reaches
either a system exception or a Reset. The
response of the WDT. For information on programming of the
Option Bits
WDT System Exception in Normal Operation
If configured to generate a system exception when a timeout occurs, the WDT issues an
exception request to the interrupt controller. The eZ8 CPU responds to the request by
fetching the System Exception vector and executing code from the vector address. After
timeout and system exception generation, the WDT is reloaded automatically and contin-
ues counting.
WDT System Exception in STOP Mode
If configured to generate a system exception when a timeout occurs and the Z8FMC16100
Series Flash MCU is in STOP mode, the WDT automatically initiates a Stop Mode Recov-
ery and generates a system exception request. Both the WDT status bit and the STOP bit in
the
STOP mode. For more information, see
Following completion of the Stop Mode Recovery the eZ8 CPU responds to the system
exception request by fetching the System Exception vector and executing code from the
vector address.
WDT Reload
Value (Hex)
0400
FFFF
Reset Status and Control Register
on page 221.
WDT Reload
(Decimal)
65,536
Value
1024
WDT
instruction causes the downcounter to be reloaded with
(with 10 kHz Typical WDT Oscillator Frequency)
Typical
102 ms
6.55 s
0000h
on page 27 are set to 1 following WDT timeout in
Reset and Stop Mode Recovery
WDT_RES
Approximate Timeout Delay
unless a
Description
Reset default value timeout delay.
Maximum timeout delay.
0000h
Z8FMC16100 Series Flash MCU
Option Bit determines the timeout
. A timeout of the WDT generates
WDT
instruction is executed by the
WDT_RES
Product Specification
Watchdog Timer Refresh
on page 21.
Option Bit, see
62