Chapter 3 Functions

■3.1 CPU

The main CPU is equipped with a 32-bit RISC chip with built-in DSP function, and the sound block section is equipped with a 16-bit CPU MC68EC000. In addition, SH-1 is installed on the subsystem side.

Table 3.1 CPU specifications

SH-2	・RISC type instruction set ・ Internal, external 32-bit bus ・ Cache 4K bytes ・ Clock 28.6MHz Note 1 ・ Built-in multiplier/divider
SH-1	・RISC type instruction set ・ Built-in A/D converter ・ Internal 32-bit bus, external 16-bit bus ・ Clock 20MHz ・ Cache 4K bytes ・ Built-in multiplier
MC68EC000	・Internal 16-bit bus, external 16-bit bus ・ CISC type instruction set ・ Clock 11.3MHz

note

Table 3.1.1 SH-2 clock details

Screen display mode	operating clock
320 dot mode (NTSC system)	26.8741MHz
352 dot mode (NTSC system)	28.6364MHz
In 320 dot mode (PAL method)	26.6877MHz
352 dot mode (PAL system)	28.4377MHz