2.5.2 Software Interrupts

The HIC provides a software method to generate an interrupt to the Host. Any write into the HICD2HTOKEN register will trigger an interrupt on the HIC_INT pin. This method enables the extension of Host interrupt capability to Device peripherals that do not have direct interrupts mapped to the EVTRIG bus. For example, Figure 9 shows the Host-Device sequence to interrupt the Host CPU on a Device ADC End Of Conversion event.

Custom data exchange protocols can be implemented using the mailbox registers (D2H_BUFn and H2D_BUFn) and the token registers. For example, the Device can fill the D2H_BUFn registers with data to be exchanged and notify the Host by writing HICD2HTOKEN register with the number of words available in the D2H_BUFn registers.

Figure 9. Software Interrupt Usage Model