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H8S2245 Datasheet(PDF) 443 Page - Renesas Technology Corp

Part # H8S2245
Description  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
PDF  818 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S2245 Datasheet(HTML) 443 Page - Renesas Technology Corp

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Section 11 Watchdog Timer
Rev.3.00 Mar. 26, 2007 Page 401 of 772
REJ09B0355-0300
11.5
Usage Notes
11.5.1
Contention between Timer Counter (TCNT) Write and Increment
If a timer counter clock pulse is generated during the T2 state of a TCNT write cycle, the write
takes priority and the timer counter is not incremented. Figure 11.8 shows this operation.
Address
φ
Internal write signal
TCNT input clock
pulse
TCNT
NM
T1
T2
TCNT write cycle
Counter write data
Figure 11.8 Contention between TCNT Write and Increment
11.5.2
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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