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7721 Datasheet(PDF) 54 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 54 Page - Renesas Technology Corp |
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54 / 577 page  CONNECTION WITH EXTERNAL DEVICES 7721 Group User’s Manual 3–7 3.1 Signals required for accessing external devices Fig. 3.1.3 Examples of operating waveforms of signals input from or output to the external (2) E ALE A0 to A7 BHE A8 to A15 A16/D0 to A23/D7 E ALE A0 to A7 BHE A8 to A15 A16/D0 to A23/D7 q External data bus width = 8 bits (BYTE = “H”) <8/16-bit data access> (e) Access beginning at even address Address Address Data Data 8-bit data access 16-bit data access Address Address Address Address Data Address Data Address Address Address Address Address 8-bit data access 16-bit data access (f) Access beginning at odd address Note: When accessing 16-bit data, 2 times of access are performed; the low-order 8 bits are accessed first, and after that, the high- order 8 bits are accessed. BLE BLE |
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