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H8/3028F 数据表(PDF) 216 Page - Renesas Technology Corp |
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H8/3028F 数据表(HTML) 216 Page - Renesas Technology Corp |
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216 / 923 page ![]() Rev. 2.00, 09/03, page 186 of 890 φ RD BACK (1) (2) (3) (4) (5) (6) BREQ HWR, LWR T0 T1 T2 AS Data bus Address bus CPU cycles CPU cycles External bus released High Address Minimum 3 cycles High-impedance High-impedance High-impedance High-impedance High-impedance Figure 6.48 Example of External Bus Master Operation In the event of contention with a bus request from an external bus master when a transition is made to software standby mode, the BACK and strobe states may be indeterminate after the transition to software standby mode (see figure 6.36). When software standby mode is used, the BRLE bit should be cleared to 0 in BRCR before executing the SLEEP instruction. |
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