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 Ricoh 5A22-02 | |
| General information | |
|---|---|
| Designed by | Ricoh |
| Performance | |
| Max.CPUclock rate | 1.79 MHz to 3.58 MHz |
| Data width | 8-bit |
| Address width | 24-bit |
TheRicoh 5A22 is an 8/16-bitmicroprocessor produced byRicoh for theSuper Nintendo Entertainment System (SNES)video game console. It is based on the 8/16-bitWDC65C816, which was developed between 1982 and 1984 for theApple IIGS personal computer. It has 92 instructions, an 8-bitdata bus, a16-bitaccumulator, and a 24-bitaddress bus. The CPU runs between 1.79 MHz and 3.58 MHz, and uses an extendedMOS Technology 6502instruction set.
In addition to the65C816 CPU core, the 5A22 contains support hardware, including:
The CPU as a whole employs a variable-speedsystem bus, with bus access times determined by the memory location accessed. The bus runs at 3.58 MHz for non-access cycles and when accessing Bus B and most internal registers, and either 2.68 or 3.58 MHz when accessing Bus A. It runs at 1.79 MHz only when accessing the controller port serial-access registers.[1] It works at approximately 1.5MIPS, and has a theoretical peak performance of 1.79 million 16-bit operations per second.
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