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Z85233 Datasheet(PDF) 39 Page - Zilog, Inc. |
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Z85233 Datasheet(HTML) 39 Page - Zilog, Inc. |
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39 / 317 page  SCC™/ESCC™ User’s Manual Interfacing the SCC/ESCC 2-20 2.4 INTERFACE PROGRAMMING (Continued) Figure 2-13. Interrupt Flow Chart (for each interrupt source). Start Interrupt Pendi Set (IP=1) Master Interrupt Enable (MIE=1)? Is Peripheral Enable Pin Act (IEI=H)? Yes Unit Selected for CPU Service (IUS=1) Interrupt Condition Exits? Specific Interrupt Enable (IEx=1)? Peripheral Request Interrupt (INT=L) IEI/IEO Daisy Chain Settles (Wait for DS CPU Initiates Statu Decode (INTACK=L Has Higher Priority Periphera Disabled Unit? (IEI=L) Yes CPU Services Highe Priority Periphera Priority Service Complete? Interrupt Still Pending (IP=1) ? Service Routine Comple ? Yes (Option) Check Othe Internal IP, Bits, RESET IUS and Ex No Yes Yes No No No Yes Yes No No No No Yes UM010901-0601 |
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