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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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STW82102B 数据表(PDF) 47 Page - STMicroelectronics |
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STW82102B 数据表(HTML) 47 Page - STMicroelectronics |
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47 / 67 page  STW82102B SPI digital interface Doc ID 018516 Rev 2 47/67 10 SPI digital interface 10.1 SPI general features The SPI digital interface is selected by hardware connection of the pin 25 (DBUS_SEL) to 3.3 V. The STW82102B IC is programmed by means of a high-speed serial-to-parallel interface with write option only. The 3-wires bus can be clocked at a frequency as high as 100 MHz to allow fast programming of the registers containing the data for RF IC configuration. The programming of the chip is done through serial words with whole length of 26 bits. The first 2 MSB represent the address of the registers. The others 24 LSB represent the value of the registers. Each data bit is stored in the internal shift register on the rising edge of the CLOCK signal. On the rising edge of the LOAD signal the outputs of the selected register are sent to the device. Figure 21. SPI input and output bit order Last DATA LOAD 1 2 23 24 25 (MSB) LOAD #4 Reg. #0 Reg. #1 Reg. #4 A1 Address bit sent (LSB) 0 decoder 00 (LSB) |
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