
ML62Q1000 Series User's Manual
Chapter 10 Watchdog Timer
FEUL62Q1000
10-15
The following figure shows details of operation timing in the window function disabled mode.
Figure 10-8
Details of Operation Timing in Window Function Disabled Mode
(1)
After the system reset is released, the WDT counter starts counting up.
(2)
The WDT counter overflow period (T
WOV
) is set to the WDTMOD register.
(3)
"0x5A" is written to the WDTCON register. (Internal pointer WDP: 0
à
1)
(4)
"0xA5" is written to the WDTCON register to clear the WDT counter. (Internal pointer WDP: 1
à
0)
(5)
"0x5A" is written to the WDTCON register. (Internal pointer WDP: 0
à
1)
(6)
When "0x5A" is written to the WDTCON register after an abnormality occurred, it is not accepted because the
internal pointer WDP is "1". (Internal pointer WDP: 1
à
0)
(7)
Although "0xA5" is written to the WDTCON register, the WDT counter is not cleared because the internal pointer
WDP is "0" and writing of "0x5A" is not accepted in (6). (Internal pointer WDP: 0
à
1)
(8)
The WDT counter overflows and a WDT interrupt request is generated. (Internal pointer WDP: 1
à
0)
Following cleared due to the overflow, the WDT counter continues counting up.
(9)
If the WDT counter is not cleared even by the software processing after the WDT interrupt and it overflows again, a
WDT reset occurs and the shift to the system reset mode takes place.
(3)
5A
(4)
A5
(5)
5A
(6)
5A
Occurrence
(7)
A5
T
WOV
Overflow period
Overflow
WDT clock
oscillation starts
(1)
Program start
5A A5
Data:
RESET_N
system reset
WDTCON Write
WDT counter
WDT reset
T
WOV
Overflow period
(2) WDTMOD
setting
WDTMOD
setting
(8) WDT interrupt
occurs
(9) WDT reset occurs
Internal pointer
WDT interrupt
Содержание ML62Q1000 Series
Страница 17: ...Chapter 1 Overview...
Страница 112: ...Chapter 2 CPU and Memory Space...
Страница 154: ...Chapter 3 Reset Function...
Страница 166: ...Chapter 4 Power Management...
Страница 196: ...Chapter 5 Interrupts...
Страница 248: ...Chapter 6 Clock generation Circuit...
Страница 274: ...Chapter 7 Low Speed Time Base Counter...
Страница 291: ...Chapter 8 16 Bit Timer...
Страница 320: ...Chapter 9 Functional Timer FTM...
Страница 382: ...Chapter 10 Watchdog Timer...
Страница 402: ...Chapter 11 Serial Communication Unit...
Страница 456: ...Chapter 12 I2 C Bus Unit...
Страница 491: ...Chapter 13 I2 C Master...
Страница 512: ...Chapter 14 DMA Controller...
Страница 531: ...Chapter 15 Buzzer...
Страница 550: ...Chapter 16 Simplified RTC...
Страница 559: ...Chapter 17 GPIO...
Страница 594: ...Chapter 18 External Interrupt Function...
Страница 612: ...Chapter 19 CRC Generator...
Страница 632: ...Chapter 20 Analog Comparator...
Страница 644: ...Chapter 21 D A Converter...
Страница 655: ...Chapter 22 Voltage Level Supervisor...
Страница 676: ...Chapter 23 Successive Approximation Type A D Converter...
Страница 709: ...Chapter 24 Regulator...
Страница 714: ...Chapter 25 Flash Memory...
Страница 743: ...Chapter 26 Code Option...
Страница 750: ...Chapter 27 LCD Driver...
Страница 788: ...Chapter 28 On Chip Debug Function...
Страница 795: ...Chapter 29 Safety Function...
Страница 813: ...Appendix A...
Страница 881: ...Revision History...