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UPD17062 Datasheet(PDF) 152 Page - Renesas Technology Corp |
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UPD17062 Datasheet(HTML) 152 Page - Renesas Technology Corp |
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152 / 298 page  150 µPD17062 Fig. 12-9 Timer Interrupt Error (2/2) (b) When the timer interrupt pulse is switched EI # EI EI EI % $ IRQBTM0 IPBTM0 INTE FF EI DI Internal pulse A Internal pulse B Timer interrupt pulse Interrupt accepted Timer interrupt pulse switched Interrupt accepted Timer interrupt pulse switched Interrupt accepted Although the timer interrupt pulse is switched to B at #, no interrupt occurs because the timer interrupt pulse does not go low. Therefore, an interrupt occurs when the interrupt pulse goes low at point $. When the timer interrupt pulse is switched to A at point %, the timer interrupt pulse goes low, and the interrupt request is accepted immediately. (c) When the IRQBTM0 flag is manipulated EI EI EI # IRQBTM0 IPBTM0 INTE FF EI DI $ Timer interrupt pulse Interrupt accepted SET1 IRQBTM0 Interrupt accepted CLR1 IRQBTM0 No interrupt accepted Interrupt accepted When the IRQBTM0 flag is set at point #, an interrupt request is accepted immediately. If the IRQBTM0 flag is reset at the same time the timer interrupt pulse goes low at point $, the interrupt request is not accepted. |
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