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Section 4
Exception Handling
Rev.2.00 Jun. 28, 2007 Page 75 of 666
REJ09B0311-0200
4.4
Traces Exception Handling
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. Before changing interrupt control modes, the T bit
must be cleared. 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 by CCR. Table
4.4 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 during the trace exception handling. However, 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 4.4
Status of CCR and EXR after Trace Exception Handling
CCR EXR
Interrupt Control Mode
I
UI
I2 to I0
T
0
Trace exception handling cannot be used.
2 1
0
[Legend]
1:
Set to 1
0:
Cleared to 0
:
Retains the previous value.
Содержание H8SX/1650
Страница 2: ...Rev 2 00 Jun 28 2007 Page ii of xxii...
Страница 106: ...Section 4 Exception Handling Rev 2 00 Jun 28 2007 Page 84 of 666 REJ09B0311 0200...
Страница 142: ...Section 5 Interrupt Controller Rev 2 00 Jun 28 2007 Page 120 of 666 REJ09B0311 0200...
Страница 326: ...Section 8 I O Ports Rev 2 00 Jun 28 2007 Page 304 of 666 REJ09B0311 0200...
Страница 470: ...Section 12 Watchdog Timer WDT Rev 2 00 Jun 28 2007 Page 448 of 666 REJ09B0311 0200...
Страница 546: ...Section 13 Serial Communication Interface SCI Rev 2 00 Jun 28 2007 Page 524 of 666 REJ09B0311 0200...
Страница 566: ...Section 14 A D Converter Rev 2 00 Jun 28 2007 Page 544 of 666 REJ09B0311 0200...
Страница 574: ...Section 16 RAM Rev 2 00 Jun 28 2007 Page 552 of 666 REJ09B0311 0200...
Страница 584: ...Section 17 Clock Pulse Generator Rev 2 00 Jun 28 2007 Page 562 of 666 REJ09B0311 0200...
Страница 638: ...Section 19 List of Registers Rev 2 00 Jun 28 2007 Page 616 of 666 REJ09B0311 0200...
Страница 668: ...Section 20 Electrical Characteristics Rev 2 00 Jun 28 2007 Page 646 of 666 REJ09B0311 0200...
Страница 676: ...Appendix Rev 2 00 Jun 28 2007 Page 654 of 666 REJ09B0311 0200...
Страница 688: ...Rev 2 00 Jun 28 2007 Page 666 of 666 REJ09B0311 0200...
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Страница 692: ...H8SX 1650 Group Hardware Manual...