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BRK (SPC700): Difference between revisions
From SnesLab
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BRK very well could be the only interrupt source on the S-SMP. It is the only instruction to unconditionally set the [[break flag]]. | BRK very well could be the only interrupt source on the S-SMP. It is the only instruction to unconditionally set the [[break flag]]. | ||
To return from the interrupt, use [[RETI]]. | To return from the [[interrupt handler]], use [[RETI]]. | ||
=== See Also === | === See Also === | ||
Revision as of 19:24, 4 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack / Interrupt | 0F | 1 byte | 8 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | 1 | . | 0 | . | . |
BRK is an SPC700 instruction that triggers a software interrupt. The program counter and flags are pushed to the stack. The program counter then jumps to the address stored at $FFDE.
Syntax
BRK
BRK very well could be the only interrupt source on the S-SMP. It is the only instruction to unconditionally set the break flag.
To return from the interrupt handler, use RETI.
See Also
References
- Table C-16 in Appendix C-9 of Book I of the official Super Nintendo development manual
- anomie's SPC700 doc