Community Translation: AURIX™ MCU: CPU0ウォッチドッグ・タイマー(WDT)のタイムアウト値の算出 - KBA235916
Version: **
The timeout value of the CPU0 WDT can be calculated using the following formula:
timeout = ((2^16 - STARTVALUE) * Divider) / fSPB
Where:
- fSPB is the frequency of the Serial Peripheral Bus
- STARTVALUE represents the fixed value 0xFFFC for calculating the timeout period and the user-programmable reload value REL (bitfield of register WDT0CON0) for calculating the normal period.
- Divider represents the user-programmable source clock division, which depending on the values of the IR0 and IR1 bitfields of the WDT0CON1 register, can get the following values:
- Definition of bitfields
|
IR0
|
IR1
|
Divider value
|
|
0
|
0
|
16384
|
|
0
|
1
|
64
|
|
1
|
0
|
256
|
|
1
|
1
|
Reserved
|
The same formula applies to the other existing CPUs, replacing WDT0CON0 and WDT0CON1 registers, respectively, with WDTxCON0 and WDTxCON1, where x represents the number of the CPU.
Note: This KBA applies to the following series of AURIX™ MCUs:
- AURIX™ TC2xx series
- AURIX™ TC3xx series
