HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 122
HD6412332
Manufacturer Part Number
HD6412332
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412332.pdf
(1244 pages)
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4.3
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 of 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 canceled by clearing the T bit in EXR to 0. It is not affected by interrupt masking.
Table 4.3 shows the state of CCR and EXR after execution of trace exception handling.
Interrupts are accepted even within the trace exception handling routine.
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.
Table 4.3
Legend:
1: Set to 1
0: Cleared to 0
—: Retains value prior to execution.
Rev.4.00 Sep. 07, 2007 Page 92 of 1210
REJ09B0245-0400
Interrupt Control Mode
Traces
Status of CCR and EXR after Trace Exception Handling
0
2
1
I
Trace exception handling cannot be used.
CCR
UI
—
I2 to I0
—
EXR
T
0
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