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UPD17072 Datasheet(PDF) 83 Page - Renesas Technology Corp |
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UPD17072 Datasheet(HTML) 83 Page - Renesas Technology Corp |
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83 / 228 page  µPD17072,17073 81 Table 11-2. Issuing Interrupt Request By Changing IEG Flag 11.9.3 Interrupt control block The level of a signal input to the INT pin can be detected by using the INT flag. This flag is set or cleared independently of interrupts; therefore, it can be used as a 1-bit general-purpose input port when the interrupt function is not used. The INT flag can also be used as a general-purpose port that can detect the rising or falling edge by reading an interrupt request flag if the interrupt corresponding to the flag is not enabled. In this case, however, the interrupt request flag is not automatically cleared and must be cleared by program. Also refer to Figure 11-10. 11.10 Internal Interrupt Two internal interrupt sources, basic timer 1, and serial interface, are available. 11.10.1 Interrupt by basic timer 1 This interrupt request is issued at fixed time intervals. For details, refer to 12. TIMER. 11.10.2 Interrupt by serial interface This interrupt request is issued when a serial output or serial input operation has been completed. For details, refer to 14. SERIAL INTERFACE. 1 → 0 (falling) (rising) 0 → 1 (rising) (falling) Changes in IEG flag INT pin status Interrupt request IRQ flag status Low level Not issued Retains previous status High level Issued Set to “1” Low level Issued Set to “1” High level Not issued Retains previous status |
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