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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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H838532H датащи(PDF) 243 Page - Renesas Technology Corp |
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H838532H датащи(HTML) 243 Page - Renesas Technology Corp |
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243 / 508 page  Section 9 Timers Rev. 1.00 May 30, 2008 Page 223 of 484 REJ09B0436-0100 9.3.5 Usage Note Note the following regarding the operation of timer C. (1) Counting errors caused by external event input Timer counter errors may occur under the following conditions. Conditions • An external event (TMIC) is used in subsleep mode. Symptom • The counter increments or decrements twice for a single external event input. Approximate rate of occurrence The approximate rate of occurrence in cases where the external event input is not synchronized with internal operation is defined by the following equation. Approximate rate of occurrence P = 30 ns / tsubcyc For example, if tsubcyc = 61.06 µs (subclock φw/2), P = 0.0005 (0.05%). If 2,000 external event inputs occur, there is a likelihood that one of them will cause the counter to increment or decrement twice (+2 or –2). The symptom described is caused by the internal circuit configuration of the device and therefore difficult to avoid. Therefore, it is not advisable to use the clock counter for applications requiring a high degree of accuracy. |
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