186
CHAPTER 12 WATCHDOG TIMER
[bit1, bit0] WT1, WT0
These bits are used to select the watchdog timer interval. Only the data items written during watchdog
timer activation are valid. Data items that are written outside watchdog timer activation are ignored.
Table 12.1-2 lists the interval settings.
These bits are write only bits.
Note:
The interval time uses the carry signal of the time-base timer or clock timer as a count clock. If the
time-base timer or clock timer is cleared, the interval time of the watchdog timer may become long.
The time-base timer is also cleared by writing "0" to the TBR bit in the time-base timer control
register (TBTC), transition from main clock mode to PLL clock mode.
Table 12.1-2 Watchdog Timer Interval Selection Bit
WT1
WT0
Interval
*
Main clock cycle count
Minimum
Maximum
0
0
approx. 3.58 ms
approx. 4.61 ms
2
14
plus or minus 2
11
cycles
0
1
approx. 14.33 ms
approx. 18.43 ms
2
16
plus or minus 2
13
cycles
1
0
approx. 57.23 ms
approx. 73.73 ms
2
18
plus or minus 2
15
cycles
1
1
approx. 458.7 ms
approx. 589.82 ms
2
21
plus or minus 2
18
cycles
*: For a source oscillation of 4 MHz.
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
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Страница 132: ...104 CHAPTER 5 CLOCKS ...
Страница 152: ...124 CHAPTER 6 CLOCK MODULATOR ...
Страница 210: ...182 CHAPTER 11 TIME BASE TIMER ...
Страница 218: ...190 CHAPTER 12 WATCHDOG TIMER ...
Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
Страница 274: ...246 CHAPTER 15 WATCH TIMER ...
Страница 306: ...278 CHAPTER 17 DTP EXTERNAL INTERRUPTS ...
Страница 338: ...310 CHAPTER 18 8 10 BIT A D CONVERTER ...
Страница 364: ...336 CHAPTER 19 UART0 UART1 ...
Страница 398: ...370 CHAPTER 20 UART2 UART3 Figure 20 5 2 ORE Set Timing Receive data RDRF ORE ...
Страница 432: ...404 CHAPTER 20 UART2 UART3 ...
Страница 482: ...454 CHAPTER 22 SERIAL I O ...
Страница 560: ...532 CHAPTER 24 STEPPING MOTOR CONTROLLER ...
Страница 582: ...554 CHAPTER 27 ROM MIRRORING MODULE ...
Страница 632: ...604 CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION ...
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Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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