r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 129

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

4.4
Traces are enabled in interrupt control mode 2. Trace mode is not activated in interrupt control
mode 0, irrespective of the state of the T bit. For details on interrupt control modes, see section 5,
Interrupt Controller.
If the T bit in EXR is set to 1, trace mode is activated. In trace mode, a trace exception occurs on
completion of each instruction. Trace mode is not affected by interrupt masking. Table 4.3 shows
the state of CCR and EXR after execution of trace exception handling. Trace mode is canceled by
clearing the T bit in EXR to 0. The T bit saved on the stack retains its value of 1, and when control
is returned from the trace exception handling routine by the RTE instruction, trace mode resumes.
Trace exception handling is not carried out after execution of the RTE instruction.
Interrupts are accepted even within the trace exception handling routine.
Table 4.3
Legend:
1:
0:
—: Retains value prior to execution
Interrupt Control Mode
0
2
Set to 1
Cleared to 0
Trace Exception Handling
Status of CCR and EXR after Trace Exception Handling
I
1
Trace exception handling cannot be used.
CCR
UI
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Rev. 1.00 Sep. 19, 2008 Page 99 of 1342
I2 to I0
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Section 4 Exception Handling
EXR
REJ09B0467-0100
T
0