Section 9 Timers
Rev. 6.00 Aug 04, 2006 page 318 of 680
REJ09B0145-0600
Figure 9.18 shows an example of watchdog timer operations.
H'F8
TCW overflow
Start
H'F8 written
in TCW
H'F8 written in TCW
Reset
Internal reset
signal
512
φ
OSC
clock cycles
H'FF
H'00
TCW count
value
Example:
φ
= 2 MHz and the desired overflow period is 30 ms.
The value set in TCW should therefore be 256 – 8 = 248 (H'F8).
2
×
10
6
×
30
×
10
–3
= 7.3
8192
Figure 9.18 Typical Watchdog Timer Operations (Example)
Содержание H8/38342
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