r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 739
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r5s72060w200fpv
Manufacturer Part Number
r5s72060w200fpv
Description
32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S72060W200FPV.pdf
(1180 pages)
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14.4.2
To change the frequency used by the PLL, use the WDT. When changing the frequency only by
switching the divider, do not use the WDT.
1. Before changing the frequency, always clear the TME bit in WTCSR to 0. When the TME bit
2. Set the type of count clock used in the CKS[2:0] bits in WTCSR and the initial value of the
3. When the frequency control register (FRQCR) is written to, this LSI stops temporarily. The
4. When the WDT count overflows, the CPG resumes supplying the clock and this LSI resumes
5. The counter stops at the value of H'00.
6. Before changing WTCNT after execution of the frequency change instruction, always confirm
is 1, an erroneous reset or interval timer interrupt may be generated when the count overflows.
counter in WTCNT. These values should ensure that the time till count overflow is longer than
the clock oscillation settling time. However, the WDT counts up using the clock after the
setting.
WDT starts counting.
operation. The WOVF flag in WRCSR is not set when this happens.
that the value of WTCNT is H'00 by reading from WTCNT.
Changing the Frequency
Rev. 2.00 Dec. 09, 2005 Page 715 of 1152
Section 14 Watchdog Timer (WDT)
REJ09B0191-0200
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