HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 446
HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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12.3.4 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 12-7 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 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.
ø
TCNT
Overflow signal
OVF
WDT internal
reset
WRST
Figure 12-7 Timing of Setting of WRST Bit and Internal Reset
H'FF
H'00
434
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