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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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PSD413A2 数据表(PDF) 45 Page - STMicroelectronics |
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PSD413A2 数据表(HTML) 45 Page - STMicroelectronics |
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45 / 123 page  PSD4XX Family 42 PSD4XX Family Table 7. 8-Bit Data Bus Table 8. 16-Bit Data Bus With BHE WRH WRL D15 – D8 D7 – D0 0 0 Odd byte Even byte 0 1 Odd byte – 1 0 – Even byte Table 9. 16-Bit Data Bus With WRH and WRL SIZ0 A0 D15 – D8 D7 – D0 0 0 Even byte Odd byte 1 0 Even byte – 1 1 – Odd byte Table 10. 16-Bit Data Bus With SIZ0, A0 LDS UDS D15 – D8 D7 – D0 0 0 Even byte Odd byte 1 0 Even byte – 0 1 – Odd byte Table 11. 16-Bit Data Bus With UDS, LDS 9.2.4 Data Byte Enable Microcontrollers have different data byte orientations with regard to the data bus. The following tables show how the PSD4XX handles the byte enable under different bus configurations. Even byte refers to locations with address A0 equal to “0”, and odd byte as locations with A0 equal to “1”. BHE A0 D15 – D8 D7 – D0 0 0 Odd byte Even byte 0 1 Odd byte – 1 0 – Even byte BHE A0 D7 – D0 X 0 Even Byte X 1 Odd Byte The PSD4XX Architecture (cont.) |
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