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H8/3021 Datasheet(PDF) 352 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 352 Page - Renesas Technology Corp

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10. Watchdog Timer
Rev.2.00 Mar. 22, 2007 Page 328 of 684
REJ09B0352-0200
10.3.4
Timing of Setting of Watchdog Timer Reset Bit (WRST)
The WRST bit in RSTCSR is valid when bits WT/
IT and TME are both set to 1 in TCSR.
Figure 10.7 shows the timing of setting of WRST and the internal reset timing. The WRST bit is
set to 1 when TCNT overflows and OVF is set to 1. At the same time an internal reset signal is
generated for the entire H8/3022 Group chip. This internal reset signal clears OVF to 0, but the
WRST bit remains set to 1. The reset routine must therefore clear the WRST bit.
φ
TCNT
Overflow signal
OVF
WRST
H'FF
H'00
WDT internal
reset
Figure 10.7 Timing of Setting of WRST Bit and Internal Reset



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