SH7713 datasheet(218/904 Pages) RENESAS

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Section 4 Exception Handling

Rev.1.50 Aug. 30, 2006 Page 178 of 860

REJ09B0288-0150

CPU Address Error in Repeat Control Period: If a CPU address error occurs in the repeat

control period, the exception is accepted but an exception code (H'070) indicating the repeat loop

period is specified in the EXPEVT. If a CPU address error occurs in instructions following a

repeat detection instruction to repeat end instruction, an exception code for instruction access or

data access is specified in the EXPEVT.

The SPC is saved according to the description in section 4.4.3, Exception in Repeat Control

Period.

After the CPU address error exception processing, the repeat control cannot be returned correctly.

To execute a repeat loop correctly, care must be taken not to generate a CPU address error in the

repeat control period.

Note:

In a repeat loop consisting of one to three instructions, some restrictions apply to repeat

detection instructions and all the remaining instructions. In a repeat loop consisting of four

or more instructions, restrictions apply to only the four instructions that include a repeat

end instruction. The restriction occurs when SR.RC[11:0]

≥ 1.

Table 4.5

Instruction Where a Specific Exception Occurs when Memory Access Exception

Occurs in Repeat Control (SR.RC[11:0]

≥ 1)

Number of Instructions in Repeat Loop

Instruction where

Exception Occurs

4 or Greater

RptDtct

RptDtct1

Instruction/data

access

Instruction/data

access

Instruction/data

access

Instruction/data

access

RptDtct2



Instruction/data

access

Instruction/data

access

Instruction/data

access

RptDtct3



Instruction/data

access

Instruction/data

access

Note:

The following labels are used here.

RptDtct:

Repeat detection instruction

RptDtct1: An instruction of one instruction following the repeat detection instruction

RptDtct2:

An instruction of two instruction following the repeat detection instruction

RptDtct3:

An instruction of three instruction following the repeat detection instruction

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