Section 16 Watchdog Timer and Reset
Rev.1.00 Dec. 13, 2005 Page 635 of 1286
REJ09B0158-0100
Figure 16.2 shows a WDT counting up operation.
Setting value
of WDTST
H'0000 0000
Counting up with
overflow signal of WDTBCNT
Interval timer mode:
Clear counter when overflowed
Clear counter
when overflowed
WDT mode:
Clear counter after
reset operation
Counting up
with Pck
Start counting up
Set flag
Time
Time
WDTCNT
value
H'0003 FFFF
H'0000 0000
TME
WOVF, IOVF
WDTBCNT
value
Reset
(internal)
Interval
timer mode
WDT
mode
Figure 16.2 WDT Counting Up Operation
16.4.4
Time for WDT Overflow
WDTBCNT is a 18-bit up-counter operated on the peripheral clock (Pck). WDTBCNT is cleared
when H'55 is set to the bits 31 to 24 in WDTBST.
If the peripheral clock frequency is 50 MHz, the WDTBCNT overflow time is approximately
5.243 ms (= 2^18 [bit]
×
1/50 [MHz]).
WDTCNT is a 12-bit counter, starts count up operation when overflow occurs in WDTBCNT. The
time until WDTCNT overflows becomes the maximum value when H'000 are set to WDTST.
Where the peripheral clock frequency is 50 MHz, the maximum overflow time is approximately
21.475 s (= 2^12 [bit]
×
5.243 [ms]).
Содержание SH7780 Series
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