_SFR_IO8( regNum ) = ( _SFR_IO8( regNum ) & maskAnd ) ^ maskEor;
(*(volatile uint8_t *)((regNum) + 0x20)) = ( (*(volatile uint8_t *)((regNum) + 0x20)) & maskAnd ) ^ maskEor;
Cool! This little work instruction is useful information for troubleshooting and future reference 