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AN2014 数据表(PDF) 39 Page - STMicroelectronics |
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AN2014 数据表(HTML) 39 Page - STMicroelectronics |
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39 / 65 page ![]() DocID10701 Rev 10 39/65 AN2014 Software considerations 64 Figure 33. I2C data polling algorithm 1. Using the READ Device code (R/W = 1) is hazardous due to I2C protocol constraints. SPI products In SPI products, a specific instruction (Read Status Register - RDSR) is used to check the status of the WIP (Write In Progress) bit in the Status Register. A loop on the RDSR command (RDSR instruction + Data byte) checks the WIP bit status. As soon as it returns to "0", the device is ready to accept new commands. For compatibility reasons, it is recommended to send the full RDSR command each time instead of continuously reading the status register. Ai11083 START Device select byte with R/W = 0 (1) ACK? STOP Ready for new command Yes Yes No Write in Progress (Re)START |
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