SPRUJ53B April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
The 7-bit addressing format is the default format after reset. Disabling expanded address (I2CMDR.XA = 0) and free data format (I2CMDR.FDF = 0) enables 7-bit addressing format.
In this format (see Figure 26-10), the first byte after a START condition (S) consists of a 7-bit target address followed by a R/W bit. R/W determines the direction of the data:
An extra clock cycle dedicated for acknowledgment (ACK) is inserted after each byte. If the ACK bit is inserted by the target after the first byte from the controller, it is followed by n bits of data from the transmitter (controller or target, depending on the R/W bit). n is a number from 1 to 8 determined by the bit count (BC) field of I2CMDR. After the data bits have been transferred, the receiver inserts an ACK bit.