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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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Z80 Datenblatt(PDF) 48 Page - Zilog, Inc. |
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Z80 Datenblatt(HTML) 48 Page - Zilog, Inc. |
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48 / 330 page  <%27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Counter/Timer Channels Figure 13. Return from Interrupt Cycle Daisy-Chain Interrupt Servicing Figure 14 illustrates a typical nested interrupt sequence that may occur in the CTC. In this example, Channel 2 interrupts and is granted service. While this channel is being serviced, higher priority Channel 1 interrupts and is granted service. The service routine for the higher priority channel is completed, and a RETI instruction is executed to signal the channel that its routine is complete (see “Return from Interrupt Cycle” on page 29 for further details). At this time, the service routine of the lower priority Channel 2 is resumed and completed. IEO CLK INT IEI RD M1 T1 T2 T3 T4 D7–D0 *INT goes Low if more interrupts are pending on the RTC. T1 T2 T3 T4 T1 ED 4D |
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