To enable faster processing of high-priority interrupts, a programmable priority masking threshold isprovided (the MPU_INTC.INTC_THRESHOLD[7:0] PRIORITYTHRESHOLD field). This priority thresholdallows preemption by higher priority interrupts; all interrupts of lower or equal priority than the thresholdare masked. However, priority 0 can never be masked by this threshold; a priority threshold of 0 is treatedthe same way as priority 1. PRIORITY and PRIORITYTHRESHOLD fields values can be set between 0x0and 0x7F; 0x0 is the highest priority and 0x7F is the lowest priority. When priority masking is notnecessary, a priority threshold value of 0xFF disables the priority threshold mechanism. This value is alsothe reset default for backward compatibility with previous versions of the INTC.