Renesas R5S72621 User Manual

 

Section 3   Floating-Point Unit (FPU) 

 

R01UH0134EJ0400  Rev. 4.00  

 

Page 101 of 2108 

Sep 24, 2014 

 

 

 
SH7262 Group, SH7264 Group 

Figure 3.4 shows the floating-point register configuration. There are sixteen 32-bit floating-point 
registers FPR0 to FPR15, referenced by specifying FR0 to FR15, DR0/2/4/6/8/10/12/14. The 
correspondence between FRPn and the reference name is determined by the PR and SZ bits in 
FPSCR. Refer figure 3.4. 

1.  Floating-point registers, FPRi (16 registers) 

FPR0 to FPR15 

2.  Single-precision floating-point registers, FRi (16 registers) 

FR0 to FR15 indicate FPR0 to FPR15 

3.  Double-precision floating-point registers or single-precision floating-point vector registers in 

pairs, DRi (8 registers) 

A DR register comprises two FR registers. 

DR0 = {FR0, FR1}, DR2 = {FR2, FR3}, DR4 = {FR4, FR5}, DR6 = {FR6, FR7}, 
DR8 = {FR8, FR9}, DR10 = {FR10, FR11}, DR12 = {FR12, FR13}, DR14 = {FR14, FR15} 

 

FPR0
FPR1
FPR2
FPR3
FPR4
FPR5
FPR6
FPR7
FPR8
FPR9

FPR10
FPR11
FPR12
FPR13
FPR14
FPR15

FR0 
FR1 
FR2 
FR3 
FR4 
FR5
FR6
FR7
FR8
FR9
FR10
FR11
FR12
FR13
FR14
FR15

DR0 

DR2 

DR4 

DR6 

DR8 

DR10 

DR12 

DR14 

Transfer instruction case: 

FPSCR.SZ = 0  FPSCR.SZ = 1

Operation instruction case:  FPSCR.PR = 0  FPSCR.PR = 1

Register name

Reference name