S-SMP

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:

• Accumulator
• X Index Register
• Y Index Register
• Program Status Word

The following registers are 16-bit:

• Program Counter
• YA

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.

See Also

• SPC700 Opcode Matrix

Reference

1. anomie's SPC700 doc