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Chapter 8
Interrupt/Exception Processing Function
Preliminary User’s Manual U15839EE1V0UM00
8.5.3 Exception status flag (EP)
The EP flag is bit 6 of PSW, and is a status flag used to indicate that exception processing is in
progress. It is set when an exception occurs.
Figure 8-23:
Exception Status Flag (EP)
31
8 7 6 5 4 3 2 1 0
Initial
value
PSW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 NP EP ID SAT CY OV S Z 00000020H
Bit Position
Bit Name
Function
6
EP
Shows that exception processing is in progress.
0: Exception processing not in progress.
1: Exception processing in progress.
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