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SH7018 Datasheet(PDF) 215 Page - Renesas Technology Corp

Part # SH7018
Description  SuperH??RISC engine
PDF  431 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7018 Datasheet(HTML) 215 Page - Renesas Technology Corp

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11.4
Notes on Use
11.4.1
TCNT Write and Increment Contention
If a timer counter (TCNT) increment clock pulse is generated during the T3 state of a write cycle
to the TCNT, the write takes priority and the timer counter is not incremented (figure 11.8).
CK
Address
Internal
write signal
TCNT
input clock
TCNT
NM
TCNT address
Counter write data
T1
T2
T3
TCNT write cycle
Figure 11.8 Contention between TCNT Write and Increment
11.4.2
Changing CKS2 to CKS0 Bit Values
If the values of bits CKS2 to CKS0 are altered while the WDT is running, the count may
increment incorrectly. Always stop the watchdog timer (by clearing the TME bit to 0) before
changing the values of bits CKS2 to CKS0.
11.4.3
Changing between Watchdog Timer/Interval Timer Modes
To prevent incorrect operation, always stop the watchdog timer (by clearing the TME bit to 0)
before switching between interval timer mode and watchdog timer mode.
11.4.4
Internal Reset With the Watchdog Timer
If the RSTE bit is cleared to 0 in the watchdog timer mode, the LSI will not reset internally when a
TCNT overflow occurs, but the TCNT and TCSR in the WDT will reset.



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