SPRUJ53B April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
The Group Command (Figure 27-27) protocol is used to send commands to more than one device within the same message. When devices on the bus detect the stop condition at the conclusion of the Group Command message, the received commands are executed concurrently. To initiate a Group Command, the GRP_CMD bit within the PMBCCR register must be set when programming the target address for the first device in the message. The rest of the message is processed as a write byte/word message. At the conclusion of the first part of the Group Command message, the firmware programs the next device address in the PMBCCR register. The PMBus module sends a repeated start on the bus and begins the next part of the message. When programming the last device address of the Group Command message, the firmware must disable the GRP_CMD bit when programming the PMBCCR register.