SPRUJ53B April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
The Alert Response Message (Figure 27-11) is utilized when the controller detects an alert condition from a target on the PMBus. In automatic address acknowledge mode, upon detection of the Alert Response Address, the PMBus module provides an acknowledgment to the controller and sends the programmed target address within the PMBTCR register. The module only responds to the message if the Alert En bit within PMBCTRL register has been previously set. After receiving the Alert Response message, the module clears the alert condition and the enable bit within the PMBCTRL register.
In manual address acknowledge mode, the firmware must read the received address from the PMBRXBUF register and transmit the desired target address back to the controller. The PMBCTRL register must be reprogrammed to disable the Alert En bit used to initiate the Alert Response message from the controller.