We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
S-SMP: Difference between revisions
From SnesLab
(Spc700 Category) |
(added stack pointer) |
||
| Line 6: | Line 6: | ||
* [[Y Index Register]] | * [[Y Index Register]] | ||
* [[Program Status Word]] | * [[Program Status Word]] | ||
* [[Stack Pointer]] | |||
The following registers are 16-bit: | The following registers are 16-bit: | ||
Revision as of 09:09, 14 December 2023
The S-SMP is a Sony SPC700 series 8-bit 65x-based MPU which serves as the SNES' sound chip. It talks to the Ricoh 5A22 over four ports via the SNES Bus. It is clocked by CPUK.
The following registers are 8-bit:
The following registers are 16-bit:
Instructions that try to access memory straddling past the end of ARAM (the last byte of which is at $FFFF) will wrap around and end up accessing the zeropage (which is at $0000). Accesses that use direct page addressing will wrap within the direct page.
The stack is always located in page one (at $0100). Memory accesses that straddle the end of the stack will wrap to the beginning of the stack.
Operands that use absolute addressing are prefixed with an exclamation point (!).