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STA328 数据表(PDF) 17 Page - STMicroelectronics |
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STA328 数据表(HTML) 17 Page - STMicroelectronics |
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17 / 57 page ![]() STA328 I2C bus specification 17/57 5.3 Write operation Following the START condition the master sends a device select code with the RW bit set to 0. The STA328 acknowledges this and then the master writes the internal address byte. After receiving the internal byte address the STA328 again responds with an acknowledgement. Figure 13. I2C write procedure Byte write In the byte write mode the master sends one data byte. This is acknowledged by the STA328. The master then terminates the transfer by generating a STOP condition. Multi-byte write The multi-byte write modes can start from any internal address. Sequential data byte writes will be written to sequential addresses within the STA328. The master generating a STOP condition terminates the transfer. 5.4 Read operation Figure 14. I2C read procedure Current address byte read Following the START condition the master sends a device select code with the RW bit set to 1. The STA328 acknowledges this and then responds by sending one byte of data. The master then terminates the transfer by generating a STOP condition. DEV-ADDR ACK START RW SUB-ADDR ACK DATA IN ACK STOP BYTE WRITE DEV-ADDR ACK START RW SUB-ADDR ACK DATA IN ACK STOP MULTIBYTE WRITE DATA IN ACK DEV-ADDR ACK START RW DATA NO ACK STOP CURRENT ADDRESS READ DEV-ADDR ACK START RW SUB-ADDR ACK DEV-ADDR ACK STOP RANDOM ADDRESS READ DATA NO ACK START RW DEV-ADDR ACK START DATA ACK DATA ACK STOP SEQUENTIAL CURRENT READ DATA NO ACK DEV-ADDR ACK START RW SUB-ADDR ACK DEV-ADDR ACK SEQUENTIAL RANDOM READ DATA ACK START RW DATA ACK NO ACK STOP DATA RW= HIGH |
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