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Z80 Datasheet(PDF) 49 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 49 Page - Zilog, Inc. |
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49 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Counter/Timer Channels Figure 14. Daisy-Chain Interrupt Servicing IEI IEO HI + IEI IEO HI + IEI IEO HI + IEI IEO HI + IEI IEO HI IEI IEO HI IEI IEO HI IEI IEO HI IEI IEO HI IEI IEO HI + IEI IEO HI IEI IEO HI IEI IEO LO IEI IEO HI IEI IEO HI IEI IEO HI IEI IEO LO IEI IEO LO IEI IEO LO IEI IEO HI HI LO LO LO HI Channel 3 Channel 2 Channel 1 Under Service Service Suspended Service Resumed Service Complete 5. Second ‘RETI’ instruction issued on completion of Channel 2 Service Routine. 4. Channel 1 service routine complete, ‘RETI’ issued, Channel 2 serviced resumed. 3. Channel 1 interrupts, suspends servicing of Channel 2. 2. Channel 2 requests an interrupt and is acknowledged. 1. Priority interrupt daisy chain before any interrupt occurs. Service Complete Under Service Channel 0 Highest Priority Channel |
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