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数据搜索系统，热门电子元器件搜索 |
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H8/3003 数据表(PDF) 149 Page - Renesas Technology Corp |
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H8/3003 数据表(HTML) 149 Page - Renesas Technology Corp |
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149 / 715 page  Figure 6-19 shows the timing when the bus right is requested by an external bus master during a read cycle in a two-state-access area. There is a minimum interval of two states from when the BREQ signal goes low until the bus is released. Figure 6-19 External-Bus-Released State (Two-State-Access Area, During Read Cycle) ø Address Data bus (D to D ) AS HWR BREQ BACK RD , LWR , 15 0 T0 T1 T2 Address 2 1 3456 High CPU cycles External bus released CPU cycles Minimum 2 cycles High-impedance High-impedance High-impedance High-impedance 1 2 3 4, 5 6 Low signal is sampled at rise of T state. signal goes low at end of CPU read cycle, releasing bus right to external bus master. pin continues to be sampled while bus is released to external bus master. High signal is sampled twice consecutively. signal goes high, ending bus-release cycle. BREQ BREQ BREQ BREQ BACK 0 131 |
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