1.6 R4000 Processor

CPU Register Overview

The central processing unit (CPU) provides the following registers:

Floating-point unit (FPU) registers are described in Chapter 6.

CPU registers can be either 32 bits or 64 bits wide, depending on the R4000 processor mode of operation.

Figure 1-2 shows the CPU registers.



Figure 1-2 CPU Registers

Two of the CPU general purpose registers have assigned functions:

The CPU has three special purpose registers:

The two Multiply and Divide registers (HI, LO) store:

The R4000 processor has no Program Status Word (PSW) register as such; this is covered by the Status and Cause registers incorporated within the System Control Coprocessor (CP0). CP0 registers are described later in this chapter.

Copyright 1996, MIPS Technologies, Inc. -- 21 MAR 96

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