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