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7721 Datasheet(PDF) 53 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 53 Page - Renesas Technology Corp |
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53 / 577 page  CONNECTION WITH EXTERNAL DEVICES 3.1 Signals required for accessing external devices 7721 Group User’s Manual 3–6 Fig. 3.1.2 Examples of operating waveforms of signals input from or output to the external (1) A0 to A7 A16/D0 to A23/D7 E ALE BHE A8/D8 to A15/D15 A0 to A7 A16/D0 to A23/D7 E ALE BHE A8/D8 to A15/D15 A0 to A7 A8/D8 to A15/D15 BHE E ALE A16/D0 to A23/D7 A0 to A7 A8/D8 to A15/D15 BHE E ALE A16/D0 to A23/D7 (a) Access beginning at even address <16-bit data access> q External data bus width = 16 bits (BYTE = “L”) Address Data(odd) Data(even) Address Address (b) Access beginning at odd address Address Address Address Data(odd) Address Address Address Data(even) <8-bit data access> (c) Access to even address Address Address Data(even) Address Address (d) Access to odd address Data(odd) Address Address BLE BLE BLE BLE |
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