SH-2A datasheet(21/501 Pages) RENESAS

Part #	SH-2A

Description	Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

PDF	501 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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Section 2 Programming Model

Rev. 3.00 Jul 08, 2005 page 7 of 484

REJ09B0051-0300

2.2.4

Floating-Point Registers

Figure 2.3 shows the floating-point registers. There are sixteen 32-bit floating-point registers,

FPR0 to FPR15. These sixteen registers are referenced as FR0 to FR15 and

DR0/2/4/6/8/10/12/14. The correspondence between FPRn and the reference name is determined

by the PR bit and SZ bit in FPSCR. See figure 2.3.

(1) Floating-Point Registers, FPRn (16 Registers)

FPR0, FPR l, FPR2, FPR3, FPR4, FPR5, FPR6, FPR7,

FPR8, FPR9, FPR10, FPR11, FPR12, FPR13, FPR14, FPR15

(2) Single-Precision Floating-Point Registers, FRi (16 Registers)

FR0 to FR15 are assigned to FPR0 to FPR15.

(3) Double-Precision Floating-Point Registers or Single-Precision Floating-Point Register

Pairs, DRi (8 Registers)

A DR register is composed of two FR registers.

DR0 = (FPR0, FPR1), DR2 = (FPR2, FPR3 ),

DR4 = (FPR4, FPR5), DR6 = (FPR6, FPR7),

DR8 = (FPR8, FPR9), DR10 = (FPR10, FPR11),

DR12 = (FPR12, FPR13), DR14 = (FPR14, FPR15)

SH-2A Datasheet(PDF) 21 Page - Renesas Technology Corp