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
(added YA) |
(wrapping notes) |
||
| Line 10: | Line 10: | ||
* [[Program Counter]] | * [[Program Counter]] | ||
* [[YA]] | * [[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 === | === See Also === | ||
* [[SPC700 Opcode Matrix]] | * [[SPC700 Opcode Matrix]] | ||
=== Reference === | |||
# [https://www.romhacking.net/documents/197 anomie's SPC700 doc] | |||
[[Category:SNES Hardware]] | [[Category:SNES Hardware]] | ||
Revision as of 17:36, 24 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.