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Section 9 Exception Handling
Rev. 4.00 Sep. 14, 2005 Page 202 of 982
REJ09B0023-0400
other than the CPU are not initialized, the contents of EXPEVT, SPC, and SSR are undefined, and
this status is not detected by an external device.
To enable acceptance of multiple exceptions, the contents of SPC and SSR must be saved while
the BL bit is set to 1 after an exception has been accepted, and then the BL bit must be cleared to
0. Before restoring the SPC and SSR, the BL bit must be set to 1.
9.2.5 Exception
Source
Acceptance Timing and Priority
Exception Request of Instruction Synchronous Type and Instruction Asynchronous Type:
Resets and interrupts are requested asynchronously regardless of the program flow. In general
exceptions, a DMA address error and a user break under the specific condition are also requested
asynchronously. The user cannot expect on which instruction an exception is requested. For
general exceptions other than a DMA address error and a user break under a specific condition,
each general exception corresponds to a specific instruction.
Re-execution Type and Processing-completion Type Exceptions: All exceptions are classified
into two types: a re-execution type and a processing-completion type. If a re-execution type
exception is accepted, the current instruction executed when the exception is accepted is
terminated and the instruction address is saved to the SPC. After returning from the exception
processing, program execution resumes from the instruction where the exception was accepted. In
a processing-completion type exception, the current instruction executed when the exception is
accepted is completed, the next instruction address is saved to the SPC, and then the exception
processing is executed.
During a delayed branch instruction and delay slot, the following operations are executed. A re-
execution type exception detected in a delay slot is accepted before executing the delayed branch
instruction. A processing-completion type exception detected in a delayed branch instruction or a
delay slot is accepted when the delayed branch instruction has been executed. In this case, the
acceptance of delayed branch instruction or a delay slot precedes the execution of the branch
destination instruction. In the above description, a delay slot indicates an instruction following an
unconditional delayed branch instruction or an instruction following a conditional delayed branch
instruction whose branch condition is satisfied. If a branch does not occur in a conditional delayed
branch, the normal processing is executed.
Acceptance Priority and Test Priority: Acceptance priorities are determined for all exception
requests. The priority of resets, general exceptions, and interrupts are determined in this order: a
reset is always accepted regardless of the CPU status. Interrupts are accepted only when resets or
general exceptions are not requested.
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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