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DA14530 Datasheet(PDF) 83 Page - Renesas Technology Corp |
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DA14530 Datasheet(HTML) 83 Page - Renesas Technology Corp |
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83 / 333 page  DA14530 Low Power Bluetooth 5.1 SoC Final Datasheet Revision 3.4 21-Dec-2021 CFR0011-120-00 83 of 332 © 2021 Renesas Electronics 13.2.3.3 Transmitting and Receiving Protocols A master can initiate data transmission and reception to/from the bus, acting as either a master- transmitter or master-receiver. A slave responds to requests from a master to either transmit data or receive data to/from the bus, acting as either a slave-transmitter or slave-receiver. Master-Transmitter and Slave-Receiver All data is transmitted in byte format with no limit on the number of bytes transferred per data transfer. After a master sends a slave address and a R/W bit or a master transmits a byte of data to a slave, the slave-receiver must respond with an acknowledge signal (ACK). When a slave-receiver does not respond with an ACK signal, the master aborts the transfer by issuing a STOP condition. The slave must leave the SDA line high so that the master can abort the transfer. If a master-transmitter is transmitting data as shown in Figure 30, the slave-receiver responds to the master-transmitter with an ACK signal after every byte of data is received. Figure 30: Master-Transmitter Protocol Master-Receiver and Slave-Transmitter If a master is receiving data as shown in Figure 31, the master responds to the slave-transmitter with an ACK signal after a byte of data has been received except for the last byte. This is the way the master-receiver notifies the slave-transmitter that this is the last byte. The slave-transmitter relinquishes the SDA line after detecting the No Acknowledge (NACK) so that the master can issue a STOP condition. When a master does not want to relinquish the bus with a STOP condition, the master can issue a RESTART condition. This is identical to a START condition except it occurs after the ACK signal. The master can then communicate with the same slave or a different slave. |
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