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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8/3028F 数据表(PDF) 218 Page - Renesas Technology Corp |
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H8/3028F 数据表(HTML) 218 Page - Renesas Technology Corp |
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218 / 923 page  Rev. 2.00, 09/03, page 188 of 890 BRCR Write Timing: Data written to BRCR to switch between A23, A22, A21, or A20 output and generic input or output takes effect starting from the T3 state of the BRCR write cycle. Figure 6.51 shows the timing when a pin is changed from generic input to A23, A22, A21, or A20 output. φ T1 T2 T3 PA7 to PA4 (A23 to A20) Address bus BRCR address High-impedance Figure 6.51 BRCR Write Timing 6.11.2 BREQ BREQ BREQ BREQ Pin Input Timing After driving the BREQ pin low, hold it low until BACK goes low. If BREQ returns to the high level before BACK goes lows, the bus arbiter may operate incorrectly. To terminate the external-bus-released state, hold the BREQ signal high for at least three states. If BREQ is high for too short an interval, the bus arbiter may operate incorrectly. |
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