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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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7721 датащи(PDF) 61 Page - Renesas Technology Corp |
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7721 датащи(HTML) 61 Page - Renesas Technology Corp |
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61 / 577 page  CONNECTION WITH EXTERNAL DEVICES 3.4 Hold function 7721 Group User’s Manual 3–14 Fig. 3.4.2 Timing of acceptance of Hold request and termination of Hold state (2) R/W ST1 HOLD ALE ST0 E Bus request (Hold) Bus request sampling <When inputting “L” level to HOLD pin while bus is used; when data access is completed with 1-bus cycle> q State when inputting “L” level to HOLD pin 8 16 8, 16 16 (Access beginning at even address) External data bus Data length External data bus width Used Clock 1 (Note 2) Floating Address A Address A Floating Floating Data Address B External address bus External address bus / External data bus BLE, BHE Bus in use Transfer of right to use bus Hold state Bus in use When a Hold request is accepted, not a new address but the address which was output immediately before is output again. Notes 1: The above diagram shows the case of no Wait. 2: Clock 1 has the same polarity and the same frequency as . Timing of signals to be input from or output to the external is ordained on the basis of clock 1. 3: Bus request (Hold) and bus request sampling are internal signals. (Note 3) (Note 3) Transfer of right to use bus |
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