EIT
4.12 Example of EIT Processing
4
EIT vector entry
BRA instruction
(Other than SBI)
(SBI)
EIT handler
PC→BPC
PSW→BPSW
(Note 1)
Hardware
preprocessing
Save BPC to the stack
Save PSW to the stack
System Break Interrupt
(SBI) processing
Save general-purpose
registers to the stack
Program being
executed
EIT event
occurs
Program terminated
or system reset
Processing by
EIT handler
Restore general-purpose
registers from the stack
(Note 1)
BPSW→PSW
BPC→PC
Restore PSW from the stack
Restore BPC from the stack
Hardware
postprocessing
RTE
Note 1: Indicates saving and restoring the PSW register bits between its PSW and BPSW fields.
Figure 4.12.3 Example of EIT Processing
32180 Group User’s Manual (Rev.1.0)
4-21
RENESAS [ RENESAS TECHNOLOGY CORP ]
