Renesas SH7781 - Manual (Page 129)

5. Exception Handling
Rev.1.00 Jan. 10, 2008 Page 99 of 1658
REJ09B0261-0100
Execute next instruction
Is highest-
priority exception
re-exception
type?
Cancel instruction execution
result
Yes
Yes
Yes
No
No
No
No
Yes
SSR ← SR
SPC ← PC
SGR ← R15
EXPEVT/INTEVT ← exception code
SR.{MD,RB,BL} ← 111
SR.IMASK ← received interuupt level (*)
PC ← (CBCR.UBDE=1 && User_Break?
DBR: (VBR + Offset))
Interrupt
requested?
General
exception requested?
Reset
requested?
EXPEVT ← exception code
SR. {MD, RB, BL, FD, IMASK} ← 11101111
PC ← H'A000 0000
Note: * When the exception of the highest priority is an interrupt.
Whether IMASK is updated or not can be set by software.
"Accepted interrupt level" is B'1111 for NMI.
Figure 5.1 Instruction Execution and Exception Handling