+ pend = READ_PEND_MUSCAT(addr);
+ pend &= ~READ_MASK_MUSCAT(addr); // only unmasked interrupts
+ pend = 39 - rc32434_clz(pend);
+ pend = READ_PEND_MUSCAT(addr);
+ pend &= ~READ_MASK_MUSCAT(addr); // only unmasked interrupts
+ pend = 39 - rc32434_clz(pend);