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DA14530 Datasheet(PDF) 82 Page - Renesas Technology Corp |
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DA14530 Datasheet(HTML) 82 Page - Renesas Technology Corp |
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82 / 333 page  DA14530 Low Power Bluetooth 5.1 SoC Final Datasheet Revision 3.4 21-Dec-2021 CFR0011-120-00 82 of 332 © 2021 Renesas Electronics 13.2.3.2 Addressing Slave Protocol There are two address formats: 7-bit address format and 10-bit address format. 7-bit Address Format In the 7-bit address format, the first seven bits (bits 7:1) of the first byte set the slave address and the LSB bit (bit 0) is the R/W bit (Figure 28). When bit 0 (R/W) is set to 0, the master writes to the slave. When bit 0 (R/W) is set to 1, the master reads from the slave. Figure 28: 7-bit Address Format 10-bit Address Format In the 10-bit address format, two bytes are transferred to set the 10-bit address. The transfer of the first byte contains the following bit definition: the first five bits (bits 7:3) notify the slaves that this is a 10-bit transfer, the next two bits (bits 2:1) set the slaves address bits 9:8, and the LSB bit (bit 0) is the R/W bit. The second byte transferred sets bits 7:0 of the slave address. Figure 29 shows the 10-bit address format and Table 39 defines the special purpose and the reserved first byte addresses. Figure 29: 10-bit Address Format Table 39: I2C Definition of Bits in First Byte in 10-bit Address Format Slave Address R/W Bits Description 0000 000 0 General Call Address. I2C Controller places the data in the receive buffer and issues a General Call interrupt. 0000 000 1 START byte. For more details, refer to "START BYTE Transfer Protocol". 0000 001 X CBUS address. I2C Controller ignores these accesses. 0000 010 X Reserved. 0000 011 X Reserved. 0000 1XX X Reserved 1111 1XX X Reserved. 1111 0XX X 10-bit slave addressing. The I2C Controller does not restrict users from using these reserved addresses. However, if these reserved addresses are used, incompatibilities with other I2C components may occur. |
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