SH7616 datasheet(166/935 Pages) RENESAS

166 / 935 page

Section 4 Exception Handling

Rev. 2.00 Mar 09, 2006 page 140 of 906

REJ09B0292-0200

4.6.3

Instructions in Repeat Loops

If a repeat loop comprises up to three instructions, neither exceptions nor interrupts are accepted.

If a repeat loop contains four or more instructions, neither exceptions nor interrupts are accepted

during the execution cycle of the first instruction or the last three instructions. If a repeat loop

contains four or more instructions, address errors only are accepted during the execution cycle of

the fourth from last instruction. For more information, see the SH-1/SH-2/SH-DSP Software

Manual.

A. All interrupts and address errors are accepted.

B. Address errors only are accepted.

C. No interrupts or address errors are accepted.

When RC

≥ 1

When RC = 0

All interrupts and address errors are accepted.

(1) One instruction

← A

← B

← C

← A

instr0

instr1

instr2

Start (End):

(4) Four or more instructions

← A

← A or C (on return from instr n)

← A

← B

← C

← A

instr0

instr1

instr n-3

instr n-2

instr n-1

instr n

instr n+1

Start:

End:

(2) Two instructions

← A

← B

← C

← A

instr0

instr1

instr2

instr3

Start:

End:

(3) Three instructions

← A

← B

← C

← A

instr0

instr1

instr2

instr3

instr4

Start:

End:

Figure 4.1 Interrupt Acceptance Restrictions in Repeat Mode

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