CPU1->CM IPC
Flags和interrupts
For CPU1_to_CM (or) CPU2_to_CM IPC module, flags 0-7 (set IPCSET[7:0]) fire interrupts to the
remote CPU. The remote CPU must configure its NVIC / ePIE module properly in order to receive
an IPC interrupt. Flags 8–31 (set via IPCSET[31:8]) do not produce interrupts. Multiple flags can be
set, acknowledged, and cleared simultaneously