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S-SMP
From SnesLab
The S-SMP is a Sony SPC700 series 8-bit 65x-based CPU which serves as the SNES' sound chip. It talks to the Ricoh cpu over four ports. 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 (!).