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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) 62 Page - Renesas Technology Corp |
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7721 датащи(HTML) 62 Page - Renesas Technology Corp |
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62 / 577 page  CONNECTION WITH EXTERNAL DEVICES 7721 Group User’s Manual 3–15 3.4 Hold function Data R/W HOLD ALE Floating E Address B Address A When a Hold request is accepted, not a new address but the address which was output immediately before is output again. ST1 ST0 Bus request (Hold) Bus request sampling Transfer of right to use bus <When inputting “L” level to HOLD pin while bus is used; when data access is completed with continuous 2-bus cycle> q State when inputting “L” level to HOLD pin 16 8 16 (Access beginning at odd address) Used External data bus Data length External data bus width Clock 1 (Note 2) Floating Address A + 1 Data External address bus / External data bus External address bus BLE, BHE Bus in use Hold state Bus in use Notes 1: The above diagram shows the case of 2- access in low-speed running. 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. Floating (Note 3) (Note 3) Transfer of right to use bus Fig. 3.4.3 Timing of acceptance of Hold request and termination of Hold state (3) |
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