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BRK

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Basic Info
Addressing Mode Opcode Length Speed
Stack 00 2 bytes 7 cycles*
Flags Affected
N V M X / B D I Z C
65c816 native mode . . . . 0 1 . .
6502 emulation mode . . . 1 0 1 . .

BRK (Break) is a 65x instruction designed to trigger a software interrupt. The byte following the opcode is called the Signature Byte. The state of the interrupt disable flag has no effect on the behavior of BRK.

Cycle Penalty

BRK takes one additional cycle in native mode as it needs to push the program counter bank register to the stack.

See Also

External Links