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UPD17072 Datasheet(PDF) 91 Page - NEC |
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UPD17072 Datasheet(HTML) 91 Page - NEC |
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91 / 226 page  µPD17072,17073 91 12.3 Basic Timer 1 12.3.1 General Figure 12-7 outlines the basic timer 1. The basic timer 1 issues an interrupt request at fixed time interval and sets the IRQBTM1 flag to 1. The time interval of the IRQBTM1 flag is set by the BTM1CK flag of the interrupt edge select register. Figure 12- 8 shows the configuration and function of the interrupt edge select register. The interrupt generated by the basic timer 1 is accepted when the IRQBTM1 flag is set, if the EI instruction has been issued and the IPBTM1 flag has been set (refer to 11. INTERRUPT). Figure 12-7. Outline of Basic Timer 1 Remark BTM1CK (bit 1 of interrupt edge select register. Refer to Figure 12-8) set the time interval at which the IRQBTM1 flag is set. Selector Divider BTM1CK flag Internal signal 75 kHz (fixed) IRQBTM1 set signal 32 ms (31.25 Hz) 8 ms (125 Hz) |
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