Section 13 Watchdog Timer (WDT)
Rev. 2.00 Mar 09, 2006 page 554 of 906
REJ09B0292-0200
13.4
Usage Notes
13.4.1
Contention between WTCNT Write and Increment
If a count-up pulse is generated at the timing shown in figure 13.8 during a watchdog timer
counter (WTCNT) write cycle, the write takes priority and the timer counter is not incremented
(figure 13.8).
WTCNT address
Address
Internal write
signal
WTCNT input
clock
WTCNT
Counter write data
N
M
Figure 13.8 Contention between WTCNT Write and Increment
13.4.2
Changing CKS2 to CKS0 Bit Values
If the values of bits CKS2 to CKS0 are altered while the WDT is running, the count may
increment incorrectly. Always stop the watchdog timer (by clearing the TME bit to 0) before
changing the values of bits CKS2 to CKS0.
13.4.3
Switching between Watchdog Timer Mode and Interval Timer Mode
The WDT may not operate correctly if it is switched between watchdog timer mode and interval
timer mode while it is running.
To ensure correct operation, always stop the watchdog timer (by clearing the TME bit to 0) before
switching between watchdog timer mode and interval timer mode.
Содержание SH7616
Страница 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...