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UPD17062 Datasheet(PDF) 151 Page - Renesas Technology Corp |
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UPD17062 Datasheet(HTML) 151 Page - Renesas Technology Corp |
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151 / 298 page  149 µPD17062 12.5.2 Timer Interrupt Error As explained in Section 12.4, an interrupt request is accepted each time the timer interrupt pulse goes low, provided that the interrupt is enabled. A timer error due to use of a timer interrupt occurs when: (1) An interrupt request is accepted for the first time after the timer interrupt is enabled. (2) An interrupt request is accepted for the first time after the timer interrupt pulse interval is switched. (3) Writing to the IRQBTM0 flag occurs. These timer error types are illustrated in Fig. 12-9. Fig. 12-9 Timer Interrupt Error (1/2) (a) When a timer interrupt is enabled IRQBTM0 IPBTM0 INTE FF EI DI tSET EI EI EI # $ % SET1 IPBTM0 Timer interrupt pulse Interrupt pending Interrupt request accepted Interrupt request accepted Interrupt request accepted At point #, an interrupt request is accepted immediately when the IPBTM0 flag is set to enable the timer interrupt. In the above case, timer error -tSET occurs. If the EI instruction is executed at point $ to enable interrupts, an interrupt occurs at the negative-going edge of the timer interrupt pulse at point %. In the above case, the time error is: -tSET < timer error < 0 |
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