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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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H8SX/1663M 数据表(PDF) 322 Page - Renesas Technology Corp |
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H8SX/1663M 数据表(HTML) 322 Page - Renesas Technology Corp |
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322 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 290 of 1468 REJ09B0412-0200 9.10.10 Controlling Byte and Word Accesses When 16-bit bus DRAM is used, two CAS signals can be used to control byte and word accesses. Figures 9.45 and 9.46 show control timing examples with use of two CAS signals (in big endian format). Figure 9.47 shows an example of connection for control with two CAS signals. T p T r T c1 T c2 B φ Address bus RAS LUCAS LLCAS WE OE (RD) D15 to D8 D7 to D0 High Row address Column address BS RD/ WR Figure 9.45 Timing Example of Byte Control with Use of Two CAS Signals (Write Access with Lowest Bit of Address = B'0, RAST = 0, CAST = 0) |
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