Data Sheet

ISM14585-L35 Specification
DOC-DS-14585-201807-3.0
Confidential Inventek Systems
Page 37
9.7.3.3 TRANSMITTING AND RECEIVING PROTOCOLS
The 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 the master
to either transmit data or receive data to/from the bus, acting as either a slave-
transmitter or slave-receiver, respectively.
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 the master sends the address and R/W bit or the master
transmits a byte of data to the slave, the slave-receiver must respond with the
acknowledge signal (ACK). When a slave-receiver does not respond with an ACK pulse,
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 the
master-transmitter is transmitting data as shown in Figure 15, then the slave-receiver
responds to the master-transmitter with an acknowledge pulse after every byte of data
is received.
Figure 15 Master-Transmitter Protocol
Master-Receiver and Slave-Transmitter
If the master is receiving data as shown in Figure 16 then the master responds to the
slave-transmitter with an acknowledge pulse after a byte of data has been received,
except for the last byte. This is the way the master-receiver notifies the slave-transmitter