SH7713 datasheet(216/904 Pages) RENESAS

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Section 4 Exception Handling

Rev.1.50 Aug. 30, 2006 Page 176 of 860

REJ09B0288-0150

SPC Saved by Exception in Repeat Control Period: If an exception is accepted in the repeat

control period while the repeat counter (RC[11:0]) in the SR register is two or greater, the program

counter to be saved may not indicate the value to be returned correctly. To execute the repeat

control after returning from an exception processing, the return address must indicate an

instruction prior to a repeat detection instruction. Accordingly, if an exception is accepted in

repeat control period, an exception other than re-execution type exception by a repeat detection

instruction cannot return to the repeat control correctly.

Table 4.3

SPC Value when Re-Execution Type Exception Occurs in Repeat Control

(RC[11:0]

≥ 2)

Number of Instructions in Repeat Loop

Instruction where

Exception Occurs

4 or Greater

RptDtct

RptDtct1

RptDtct2



RptDtct1

RS-4

RptDtct3



RptDtct1

RS-2

Note:

The following labels are used here.

RptDtct:

Repeat detection instruction address

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

RptDtct2: An instruction address two instruction following the repeat detection instruction

RptDtct3: An instruction address three instruction following the repeat detection instruction

RS:

Repeat start instruction address

If a re-execution type exception is accepted at an instruction in the hatched areas above, a

return address to be saved in the SPC is incorrect. If RC[11:0] is 1 or 0, a correct return

address is saved in the SPC.

Illegal Instruction Exception in Repeat Control Period: If one of the following instructions is

executed at the address following RptDtct1, a general illegal instruction exception occurs. For

details on an address to be saved in the SPC, refer to the description in section 4.4.3, Exception in

Repeat Control Period.

• Branch instructions

BRA, BSR, BT, BF, BT/S, BF/S, BSRF, RTS, BRAF, RTE, JSR, JMP, TRAPA

• Repeat control instructions

SETRC, LDRS, LDRE

• Load instructions for SR, RS, and RE

LDC Rn,SR, LDC @Rn+,SR, LDC Rn,RE, LDC @Rn+,RE, LDC Rn,RS, LDC @Rn+,Rs

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