Status

Name:
STATUS
Offset:
0x01
Reset:
0x00
Access:
-
Bit76543210
NMIEXLVL1EXLVL0EX
AccessRRR
Reset000

Bit 7 – NMIEX: Non-Maskable Interrupt Executing

Non-Maskable Interrupt Executing

This flag is set if a non-maskable interrupt is executing. The flag is cleared when returning (RETI) from the interrupt handler.

Bit 1 – LVL1EX: Level 1 Interrupt Executing

Level 1 Interrupt Executing

This flag is set when a priority level 1 interrupt is executing, or when the interrupt handler has been interrupted by an NMI. The flag is cleared when returning (RETI) from the interrupt handler.

Bit 0 – LVL0EX: Level 0 Interrupt Executing

Level 0 Interrupt Executing

This flag is set when a priority level 0 interrupt is executing, or when the interrupt handler has been interrupted by a priority level 1 interrupt or an NMI. The flag is cleared when returning (RETI) from the interrupt handler.