Rev. 3.0, 10/02, page 356 of 686
Address
Internal write
signal
TCNT input
clock
TCNT
N
M
T1
T2
TCNT write cycle
Counter write data
Figure 12.8 Contention between TCNT Write and Increment
12.5.3
Changing Value of CKS2 to CKS0
If bits CKS0 to CKS2 in TCSR are written to while the WDT is operating, errors could occur in
the incrementation. Software must be used to stop the watchdog timer (by clearing the TME bit to
0) before changing the value of bits CKS0 to CKS2.
12.5.4
Switching between Watchdog Timer Mode and Interval Timer Mode
If the mode is switched from watchdog timer to interval timer while the WDT is operating, errors
could occur in the incrementation. Software must be used to stop the watchdog timer (by clearing
the TME bit to 0) before switching the mode.
12.5.5
Internal Reset in Watchdog Timer Mode
This LSI is not reset internally if TCNT overflows while the RSTE bit is cleared to 0 during
watchdog timer operation, however TCNT and TCSR of the WDT are reset.
TCNT, TCSR, or RSTCR cannot be written to for 132 states following an overflow. During this
period, any attempt to read the WOVF flag is not acknowledged. Accordingly, wait 132 states
after overflow to write 0 to the WOVF flag for clearing.
Summary of Contents for H8S/2215 Series
Page 4: ...Rev 3 0 10 02 page iv of lviii ...
Page 6: ...Rev 3 0 10 02 page vi of lviii ...
Page 28: ...Rev 3 0 10 02 page xxviii of lviii ...
Page 122: ...Rev 3 0 10 02 page 64 of 686 ...
Page 132: ...Rev 3 0 10 02 page 74 of 686 ...
Page 156: ...Rev 3 0 10 02 page 98 of 686 ...
Page 198: ...Rev 3 0 10 02 page 140 of 686 ...
Page 320: ...Rev 3 0 10 02 page 262 of 686 ...
Page 384: ...Rev 3 0 10 02 page 326 of 686 ...
Page 474: ...Rev 3 0 10 02 page 416 of 686 ...
Page 608: ...Rev 3 0 10 02 page 550 of 686 ...
Page 614: ...Rev 3 0 10 02 page 556 of 686 ...
Page 650: ...Rev 3 0 10 02 page 592 of 686 ...
Page 652: ...Rev 3 0 10 02 page 594 of 686 ...
Page 680: ...Rev 3 0 10 02 page 622 of 686 ...
Page 732: ...Rev 3 0 10 02 page 674 of 686 ...
Page 740: ...Rev 3 0 10 02 page 682 of 686 ...