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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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Z80 데이터시트(PDF) 47 Page - Zilog, Inc. |
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Z80 데이터시트(HTML) 47 Page - Zilog, Inc. |
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47 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Counter/Timer Channels Figure 12. Interrupt Acknowledge Cycle Return from Interrupt Cycle Figure 13 illustrates the timing associated with the RETI Instruction. This instruction is used at the end of an Interrupt Service Routine to initialize the daisy-chain enable lines for control of nested priority interrupt handling. The CTC decodes the two-byte RETI code internally and determines whether it is intended for a channel being serviced. When several Z80 peripheral chips are in the daisy-chain, IEI becomes active on the chip currently under service when an EDH Op Code is decoded. If the following Op Code is 4DH, the peripheral being serviced is re-initialized and its IEO becomes active. DATA CLK T1 T1 T2 TW*T3 TW*T4 Vector INT IEI RD IORQ M1 |
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