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SH7052 bảng dữ liệu(PDF) 450 Page - Renesas Technology Corp

tên linh kiện SH7052
Giải thích chi tiết về linh kiện  SuperHTM RISC engine
PDF  919 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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SH7052 bảng dữ liệu(HTML) 450 Page - Renesas Technology Corp

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12.4
Usage Notes
12.4.1
TCNT Write and Increment Contention
If a timer counter increment clock pulse is generated during the T3 state of a write cycle to TCNT,
the write takes priority and the timer counter is not incremented (figure 12.8).
CK
Address
Internal
write signal
TCNT
input clock
TCNT
NM
TCNT address
Counter write data
T1
T2
T3
TCNT write cycle
Figure 12.8 Contention between TCNT Write and Increment
12.4.2
Changing CKS2 to CKS0 Bit Values
If the values of bits CKS2 to CKS0 in the timer control/status register (TCSR) are rewritten while
the WDT is running, the count may not increment correctly. Always stop the watchdog timer (by
clearing the TME bit to 0) before changing the values of bits CKS2 to CKS0.
12.4.3
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.



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