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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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ST90135 数据表(PDF) 137 Page - STMicroelectronics |
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ST90135 数据表(HTML) 137 Page - STMicroelectronics |
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137 / 190 page  137/190 ST90158 - SERIAL PERIPHERAL INTERFACE (SPI) SERIAL PERIPHERAL INTERFACE (Cont’d) 9.4.7 S-Bus Interface The S-bus is a three-wire bidirectional data-bus, possessing functional features similar to the I 2C- bus. As opposed to the I2C-bus, the Start/Stop conditions are determined by encoding the infor- mation on 3 wires rather than on 2, as shown in Figure 71. The additional line is referred as SEN. SPI Working with S-bus The S-bus protocol uses the same pin configura- tion as the I2C-bus for generating the SCL and SDA lines. The additional SEN line is managed through a standard ST9 I/O port line, under soft- ware control (see Figure 67). Figure 70. Mixed S-bus and I2C-bus System n Figure 71. S-bus Configuration n 12 3 4 5 6 START STOP VA00440 SCL SDA SEN 9 |
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