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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8S/2240 数据表(PDF) 395 Page - Renesas Technology Corp |
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H8S/2240 数据表(HTML) 395 Page - Renesas Technology Corp |
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395 / 818 page  Section 9 16-Bit Timer Pulse Unit (TPU) Rev.3.00 Mar. 26, 2007 Page 353 of 772 REJ09B0355-0300 Caution on Period Setting When counter clearing by compare match is set, TCNT is cleared in the final state in which it matches the TGR value (the point at which the count value matched by TCNT is updated). Consequently, the actual counter frequency is given by the following formula: f = φ (N + 1) Where f: Counter frequency φ: Operating frequency N: TGR set value Contention between TCNT Write and Clear Operations If the counter clear signal is generated in the T2 state of a TCNT write cycle, TCNT clearing takes precedence and the TCNT write is not performed. Figure 9.45 shows the timing in this case. Counter clear signal Write signal Address φ TCNT address TCNT TCNT write cycle T1 T2 N H'0000 Figure 9.45 Contention between TCNT Write and Clear Operations |
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