SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
The Alert Response Message (Figure 29-11) is utilized when the controller detects an alert condition from a target. In controller mode, the Alert Response Message is simply a Receive Byte message with PEC disabled and the target address set to 0xC (Alert Response address). The PMBus module detects the alert condition on an input and interrupts the firmware indicating the assertion of an alert condition (target desires to communicate with the controller). Programming the PMBCCR register with the Alert Response address initiates the Alert Response message and provides the device address of the target requesting service. The device address is found in the PMBRXBUF register following receipt of the EOM interrupt.