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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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7721 Scheda tecnica(PDF) 147 Page - Renesas Technology Corp |
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7721 Scheda tecnica(HTML) 147 Page - Renesas Technology Corp |
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147 / 577 page  TIMER A 7721 Group User’s Manual 8–28 8.4 Event counter mode [Precautions for event counter mode] 1. While counting is in progress, by reading the timer Aj register, the counter value can be read out at any timing. However, if the timer Aj register is read at the reload timing shown in Figure 8.4.9, the value “FFFF16” (at an underflow) or “000016” (at an overflow) is read out. If reading is performed in the period from when a value is set into the timer Aj register with the counter stopped until the counter starts counting, the set value is correctly read out. Fig. 8.4.9 Reading timer Aj register 2. The TAjOUT pin is used for all functions listed below. Accordingly, only one of these functions can be selected for each timer. •Switching between countup and countdown by TAjOUT pin’s input signal •Pulse output function •Two-phase pulse signal processing function 21 0 n n – 1 Counter value (Hex.) 21 0 FFFF n – 1 Read value (Hex.) Reload Time n = Reload register’s contents (1) For countdown FFFD FFFE FFFF n n + 1 FFFD FFFE FFFF 0000 n + 1 (2) For countup Counter value (Hex.) Read value (Hex.) Reload Time n = Reload register’s contents |
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