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376 Datasheet(PDF) 51 Page - Intel Corporation |
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376 Datasheet(HTML) 51 Page - Intel Corporation |
51 / 95 page 376 EMBEDDED PROCESSOR 240182 – 28 Interrupt Vector (0 – 255) is read on D0 – D7 at end of second Interrupt Acknowledge bus cycle Because each Interrupt Acknowledge bus cycle is followed by idle bus states asserting NA has no practical effect Choose the approach which is simplest for your system hardware design Figure 413 Interrupt Acknowledge Cycles During both interrupt acknowledge cycles D15–D0 float No data is read at the end of the first interrupt acknowledge cycle At the end of the second inter- rupt acknowledge cycle the 80376 will read an ex- ternal interrupt vector from D7–D0 of the data bus The vector indicates the specific interrupt number (from 0 – 255) requiring service HALT INDICATION CYCLE The 80376 execution unit halts as a result of execut- ing a HLT instruction Signaling its entrance into the halt state a halt indication cycle is performed The halt indication cycle is identified by the state of the bus definition signals and a byte address of 2 See the Bus Cycle Definition Signals section The halt indication cycle must be acknowledged by READY asserted A halted 80376 resumes execution when INTR (if interrupts are enabled) NMI or RESET is asserted 51 |
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