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S-SMP: Difference between revisions
From SnesLab
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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. | 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 (!). | |||
=== See Also === | === See Also === | ||
Revision as of 18:42, 25 July 2023
The Sony SPC700 is an 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 (!).