Table 2.1 Initial Register Values - Hitachi SH7751 Hardware Manual

Floating-Point Registers: There are thirty-two floating-point registers, FR0–FR15 and XF0–
XF15. FR0–FR15 and XF0–XF15 can be assigned to either of two banks (FPR0_BANK0–
FPR15_BANK0 or FPR0_BANK1–FPR15_BANK1).
FR0–FR15 can be used as the eight registers DR0/2/4/6/8/10/12/14 (double-precision floating-
point registers, or pair registers) or the four registers FV0/4/8/12 (register vectors), while XF0–
XF15 can be used as the eight registers XD0/2/4/6/8/10/12/14 (register pairs) or register matrix
XMTRX.
Register values after a reset are shown in table 2.1.
Table 2.1 Initial Register Values
Type
General registers
Control registers
System registers
Floating-point
registers
Note: * Initialized by a power-on reset and manual reset.
The register configuration in each processor mode is shown in figure 2.2.
Switching between user mode and privileged mode is controlled by the processor mode bit (MD)
in the status register.
Registers
R0_BANK0–R7_BANK0,
R0_BANK1–R7_BANK1,
R8–R15
SR
GBR, SSR, SPC, SGR,
DBR
VBR
MACH, MACL, PR, FPUL
PC
FPSCR
FR0–FR15, XF0–XF15
Initial Value*
Undefined
MD bit = 1, RB bit = 1, BL bit = 1, FD bit = 0,
I3–I0 = 1111 (H'F), reserved bits = 0, others
undefined
Undefined
H'00000000
Undefined
H'A0000000
H'00040001
Undefined
Rev. 3.0, 04/02, page 37 of 1064