HD6432646 Hitachi, HD6432646 Datasheet - Page 464
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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12.5.2
If bits PSS and CKS2 to CKS0 in TCSR are written to while the WDT is operating, errors could
occur in the incrementation. Software must stop the watchdog timer (by clearing the TME bit to 0)
before changing the value of bits PSS and CKS2 to CKS0.
12.5.3
If the mode is switched from watchdog timer to interval timer, or vice versa, while the WDT is
operating, errors could occur in the incrementation. Software must stop the watchdog timer (by
clearing the TME bit to 0) before switching the mode.
12.5.4
In watchdog timer mode, the H8S/2646 Series will not be reset internally if TCNT overflows
while the RSTE bit is cleared to 0. When this module is used as a watchdog timer, the RSTE bit
must be set to 1 beforehand.
12.5.5
When the OVF flag setting conflicts with the OVF flag reading in interval timer mode, writing 0
to the OVF bit may not clear the flag even though the OVF bit has been read while it is 1. If there
is a possibility that the OVF flag setting and reading will conflict, such as when the OVF flag is
polled with the interval timer interrupt disabled, read the OVF bit while it is 1 at least twice before
writing 0 to the OVF bit to clear the flag.
430
Changing Value of PSS and CKS2 to CKS0
Switching between Watchdog Timer Mode and Interval Timer Mode
Internal Reset in Watchdog Timer Mode
OVF Flag Clearing in Interval Timer Mode
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