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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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H8/3003 数据表(PDF) 151 Page - Renesas Technology Corp |
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H8/3003 数据表(HTML) 151 Page - Renesas Technology Corp |
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151 / 715 page  DDR Write Timing: Data written to a data direction register (DDR) to change a CSn pin from CSn output to generic input, or vice versa, takes effect starting from the T3 state of the DDR write cycle. Figure 6-21 shows the timing when the CS1 pin is changed from generic input to CS1 output. Figure 6-21 DDR Write Timing 6.4.3 BREQ 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 low, 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. ø Address CS1 T1 T2 T3 P8DDR address High impedance 133 |
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