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H8/3028F 数据表(PDF) 438 Page - Renesas Technology Corp |
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H8/3028F 数据表(HTML) 438 Page - Renesas Technology Corp |
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438 / 923 page  Rev. 2.00, 09/03, page 408 of 890 10.7.8 Contention between Compare Matches A and B If compare matches A and B occur at the same time, the 8-bit timer operates according to the relative priority of the output states set for compare match A and compare match B, as shown in table 10.7. Table 10.7 Timer Output Priority Order Output Setting Priority Toggle output High 1 output 0 output No change Low 10.7.9 8TCNT Operation and Internal Clock Source Switchover Switching internal clock sources may cause 8TCNT to increment, depending on the switchover timing. Table 10.8 shows the relation between the time of the switchover (by writing to bits CKS1 and CKS0) and the operation of 8TCNT. The 8TCNT input clock is generated from the internal clock source by detecting the rising edge of the internal clock. If a switchover is made from a low clock source to a high clock source, as in case no. 3 in table 10.8, the switchover will be regarded as a falling edge, a 8TCNT clock pulse will be generated, and 8TCNT will be incremented. 8TCNT may also be incremented when switching between internal and external clocks. |
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