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HD6432142 Datasheet(PDF) 464 Page - Renesas Technology Corp

Part # HD6432142
Description  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
PDF  1177 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432142 Datasheet(HTML) 464 Page - Renesas Technology Corp

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Section 14 Watchdog Timer (WDT)
Rev. 4.00 Sep 27, 2006 page 420 of 1130
REJ09B0327-0400
14.5
Usage Notes
14.5.1
Contention between Timer Counter (TCNT) Write and Increment
If a timer counter clock pulse is generated during the T
2 state of a TCNT write cycle, the write
takes priority and the timer counter is not incremented. Figure 14.7 shows this operation.
Address
φ
Internal write signal
TCNT input clock
TCNT
NM
T1
T2
TCNT write cycle
Counter write data
Figure 14.7 Contention between TCNT Write and Increment
14.5.2
Changing Value of CKS2 to CKS0
If bits 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 CKS2 to CKS0.



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