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WTS701MF/T 数据表(PDF) 19 Page - Winbond |
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WTS701MF/T 数据表(HTML) 19 Page - Winbond |
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19 / 77 page  WTS701 Publication Release Date: May 2003 - 19 - Revision 3.09 T res et T res et > 0 .5 µ s RESET Figure 8. Reset Condition Timing. 7.3 COMMUNICATION PROTOCOL The WTS701 is controlled by a series of SPI transactions to send commands to the device. The general format of an SPI transaction is shown in Figure 9. A transaction is always started by sending a command word. The command word consists of a command byte followed by a command data byte. At the same time, the status register is shifted out on the MISO line. What follows depends on what command is sent. The general case is that following the command word, up to n-bytes of data can be sent to the device and n-bytes can be read from the device. An SPI transaction is finished when SS is returned to the HIGH condition. DATAn DATA1 DATAn DATA1 DATA0 DATA0 CMD DATA STATUS BYTE 1 CMD BYTE STATUS BYTE 0 MOSI MISO MSB LSB time 7 7 7 7 7 77 7 0000 0000 Figure 9. SPI Transaction Format. |
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