Hitachi SH7751 Hardware Manual page 188

(2) IRL Interrupts


Source: The interrupt mask bit setting in SR is smaller than the IRL (3–0) level, and the BL bit
in SR is 0 (accepted at instruction boundary).


Transition address: VBR + H'0000 0600


Transition operations:
The PC contents immediately after the instruction at which the interrupt is accepted are set in
SPC. The SR and R15 contents at the time of acceptance are set in SSR and SGR.
The code corresponding to the IRL (3–0) level is set in INTEVT. See table 19.4, for the
corresponding codes. The BL, MD, and RB bits are set to 1 in SR, and a branch is made to
VBR + H'0600. The acceptance level is not set in the interrupt mask bits in SR. When the BL
bit in SR is 1, the interrupt is masked. For details, see section 19, Interrupt Controller (INTC).
IRL()
{
SPC = PC;
SSR = SR;
SGR = R15;
INTEVT = H'00000200 ~ H'000003C0;
SR.MD = 1;
SR.RB = 1;
SR.BL = 1;
PC = VBR + H'00000600;
}
Rev. 3.0, 04/02, page 149 of 1064