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4.5
Trap Instruction
Trap instruction exception handling starts when a TRAPA instruction is executed. Trap instruction exception handling can
be executed at all times in the program execution state.
The TRAPA instruction fetches a start address from a vector table entry corresponding to a vector number from 0 to 3, as
specified in the instruction code.
Table 4-5 shows the status of CCR and EXR after execution of trap instruction exception handling.
Table 4-5
Status of CCR and EXR after Trap Instruction Exception Handling
CCR
EXR
Interrupt Control Mode
I
UI
I2 to I0
T
0
1
—
—
—
2
1
—
—
0
Legend:
1: Set to 1
0: Cleared to 0
—: Retains value prior to execution.
4.6
Stack Status after Exception Handling
Figure 4-4 shows the stack after completion of trap instruction exception handling and interrupt exception handling.
SP
SP
CCR
PC
(24 bits)
CCR
PC
(24 bits)
Reserved
*
EXR
(a) Interrupt control mode 0
(b) Interrupt control mode 2
Note:
*
Ignored on return.
Figure 4-4 Stack Status after Exception Handling (Advanced Modes)
Содержание ZTAT H8S/2357F
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