SPC 700
The Sony SPC 700 is the S-SMP's integrated 8-bit CPU core manufactured by Sony with an instruction set similar to that of the MOS Technology 6502 (as used in the Commodore 64 and Vic 20, Apple II, BBC Micro and the original NES). Applications range from sound CPUs like Nintendo's S-SMP and the microcontroller series CXP82832/82840/82852/82860. The Proson A/V receiver 2300 DTS uses an CXP82860 microcontroller that utilises the SPC 700 CPU core.
Read more about this topic: Nintendo S-SMP