r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 146

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

5. Exception Handling
(11) General FPU Disable Exception
• Source: Decoding of an FPU instruction* not in a delay slot with SR.FD = 1
• Transition address: VBR + H'00000100
• Transition operations:
Note: * FPU instructions are instructions in which the first 4 bits of the instruction code are F
Rev.1.00 Jan. 10, 2008 Page 116 of 1658
REJ09B0261-0100
General_fpu_disable_exception()
{
}
The PC and SR contents for the instruction at which this exception occurred are saved in SPC
and SSR. The R15 contents at this time are saved in SGR.
Exception code H'800 is set in EXPEVT. The BL, MD, and RB bits are set to 1 in SR, and a
branch is made to PC = VBR + H'0100.
SPC = PC;
SSR = SR;
SGR = R15;
EXPEVT = H'0000 0800;
SR.MD = 1;
SR.RB = 1;
SR.BL = 1;
PC = VBR + H'0000 0100;
(but excluding undefined instruction H'FFFD), and the LDS, STS, LDS.L, and STS.L
instructions corresponding to FPUL and FPSCR.