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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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H8S/2240 数据表(PDF) 193 Page - Renesas Technology Corp |
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H8S/2240 数据表(HTML) 193 Page - Renesas Technology Corp |
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193 / 818 page  Section 6 Bus Controller Rev.3.00 Mar. 26, 2007 Page 151 of 772 REJ09B0355-0300 6.4.1 On-Chip Memory (ROM, RAM) Access Timing On-chip memory is accessed in one state. The data bus is 16 bits wide, permitting both byte and word transfer instruction. Figure 6.4 shows the on-chip memory access cycle. Figure 6.5 shows the pin states. T1 φ Internal address bus Bus cycle Address Read data Write data Internal read signal Internal data bus Internal write signal Internal data bus Read access Write access Figure 6.4 On-Chip Memory Access Cycle Bus cycle T1 Unchanged Address bus AS RD HWR, LWR Data bus φ High High High High-impedance state Figure 6.5 Pin States during On-Chip Memory Access |
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