SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
The event messages which are generated from the event to interrupt bit steering logic are input to the Interrupt Status registers. Each time an event is received, the interrupt status registers machine will assert or de-assert the specified bit in the specified register. The assertion and de-assertion in the interrupt status register is unaffected by the interrupt enable state. When an up event is received, the corresponding bit is set and when a down event is received, the corresponding bit is cleared. Some sources of input events will not include the ability to send a down event. In these cases, the interrupt router provides the ability to clear the status bits through the Interrupt Source Clear register. The host will write a one to the specific bit in the register which is to be cleared and the interrupt status machine will clear the bit internally. It is not intended that the Host directly clear bits which are automatically cleared via down events from the source itself.