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H8SX/1663R Datasheet(PDF) 883 Page - Renesas Technology Corp |
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H8SX/1663R Datasheet(HTML) 883 Page - Renesas Technology Corp |
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883 / 1504 page  Section 17 32K Timer (TM32K) Rev. 2.00 Sep. 24, 2008 Page 851 of 1468 REJ09B0412-0200 To avert contention between initialization of the up-counter due to the changed value of the bit and counting operation, change the CKS1 bit from 0 to 1 within the 32KOVI interrupt routine. Timing of the operation of changing the CKS1 bit when EXCKSN=0 is shown in figure 17.3. Note that generation of the 32KOVI interrupt will fail once if there is a conflict between the timing with which the CKS1 bit is changed from 1 to 0 and the value of TCNT32K3 becomes H'3B. This is shown in figure 17.4. H'3B H'0000 H'FFFF TCNT32K3 TCNT32K1, TCNT32K2 H'0001 TME = 1 CKS = 0 H'0002 H'0003 H'0001 H'0002 H'0001 H'0002 H'00 32KOVI CKS1 Time Operate in interrupt handling routine 3 cycles of the SUBCK clock width Figure 17.3 Operation of Changing the CKS1 bit when EXCKSN = 0 |
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