Section 4 Exception Handling
Rev. 2.00 Mar 09, 2006 page 139 of 906
REJ09B0292-0200
4.6
When Exception Sources Are Not Accepted
When an address error or interrupt is generated after a delayed branch instruction or interrupt-
disabled instruction, it is sometimes not immediately accepted but is stored instead, as described in
table 4.10. When this happens, it will be accepted when an instruction for which exception
acceptance is possible is decoded.
Table 4.10 Exception Source Generation Immediately after a Delayed Branch Instruction
or Interrupt-Disabled Instruction
Exception Source
Point of Occurrence
Address Error
Interrupt
Immediately after a delayed branch instruction
*
1
Not accepted
Not accepted
Immediately after an interrupt-disabled instruction
*
2
Accepted
Not accepted
A repeat loop comprising up to three instructions (instruction
fetch cycle not generated)
First instruction or last three instructions in a repeat loop
containing four or more instructions
Not accepted
Not accepted
Fourth from last instruction in a repeat loop containing four
or more instructions
Accepted
Not accepted
Notes: 1. Delayed branch instructions: JMP, JSR, BRA, BSR, RTS, RTE, BF/S, BT/S, BSRF,
BRAF
2. Interrupt-disabled instructions: LDC, LDC.L, STC, STC.L, LDS, LDS.L, STS, STS.L
4.6.1
Immediately after a Delayed Branch Instruction
When an instruction placed immediately after a delayed branch instruction (delay slot) is decoded,
neither address errors nor interrupts are accepted. The delayed branch instruction and the
instruction located immediately after it (delay slot) are always executed consecutively, so no
exception handling occurs between the two.
4.6.2
Immediately after an Interrupt-Disabled Instruction
When an instruction immediately following an interrupt-disabled instruction is decoded, interrupts
are not accepted. Address errors are accepted.
Содержание SH7616
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Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...