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Electrical Characteristics CLK 26 4 IACK DS 14 IEI 15 17 (SEE NOTE) IEO 9 16 D0 - D7 6 DTACK 13 18 7 NOTE: IEO only goes low if no acknowledgeable interrupt is pending. If IEO goes low, DTACK and the data bus remain in the high-impendance state. Figure 8-5. Interrupt Acknowledge Cycle (IEI Low) FIGURE - INTERRUPT ACKNOWLEDGE CYCLE (IEI Low) TIMING MC68HC901UM / AD 8-9 MC68HC901 USER’S MANUAL MOTOROLA
