Chapter 3 Register Details

■ 3.1 Register list

Table 3.1 lists the SCU registers. Below, the items are divided according to the register generic name, and the registers are explained in detail.

Table 3.1 Register list

Register generic	Register name	Start address	Last address	size
DMA control register	Level 0-DMA set register	25FE0000 H	25FE0017 H	24 bytes
	Level 1-DMA set register	25FE0020 H	25FE0037 H	24 bytes
	Level 2-DMA set register	25FE0040 H	25FE0057 H	24 bytes
DSP control port	DSP program control port	25FE0080 H	25FE0083 H	4 bytes
	DSP program RAM data port	25FE0084 H	25FE0087 H	4 bytes
	DSP data RAM address port	25FE0088 H	25FE008B H	4 bytes
	DSP data RAM data port	25FE008C H	25FE008F H	4 bytes
Timer register	Timer 0 compare register	25FE0090 H	25FE0093 H	4 bytes
	Timer 1 set data register	25FE0094 H	25FE0097 H	4 bytes
	Timer 1 mode register	25FE0098 H	25FE009B H	4 bytes
Interrupt control register	Interrupt mask register	25FE00A0 H	25FE00A3 H	4 bytes
	Interrupt status register	25FE00A4 H	25FE00A7 H	4 bytes
A-Bus control register	A-Bus interrupt acknowledge	25FE00A8 H	25FE00AB H	4 bytes
	A-Bus setting register	25FE00B0 H	25FE00B7 H	8 bytes
	A-Bus refresh register	25FE00B8 H	25FE00BB H	4 bytes
SCU control register	SCU SDRAM select register	25FE00C4 H	25FE00C7 H	4 bytes
	SCU version register	25FE00C8 H	25FE00CB H	4 bytes

Be sure to use the cache-through address to access the SCU registers.