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SH7713 датащи(PDF) 120 Page - Renesas Technology Corp |
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SH7713 датащи(HTML) 120 Page - Renesas Technology Corp |
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120 / 904 page ![]() Section 3 DSP Operating Unit Rev.1.50 Aug. 30, 2006 Page 80 of 860 REJ09B0288-0150 • Example 2: Repeat loop consisting of three instructions LDRS RptStart +4 ; Sets (repeat detection instruction address + 4) to the RS register LDRE RptStart +4 ; Sets (repeat detection instruction address + 4) to the RE register SETRC #4 ; Sets the number of repetitions (4) to the RC[11:0] bits of the SR register ; If RE-RS==0 during SETRC instruction execution, the repeat loop is regarded as three-instruction repeat. RptDtct: instr0 ; An instruction prior to the Repeat start instruction is regarded as a repeat detection instruction. RptStart: instr1 ; [Repeat start instruction] Instr2 ; RptEnd: instr3 ; [Repeat end instruction] • Example 3: Repeat loop consisting of two instructions LDRS RptStart +6 ; Sets (repeat detection instruction address + 6) to the RS register LDRE RptStart +4 ; Sets (repeat detection instruction address + 4) to the RE register SETRC #4 ; Sets the number of repetitions (4) to the RC[11:0] bits of the SR register ; If RE-RS==-2 during SETRC instruction execution, the repeat loop is regarded as two-instruction repeat. RptDtct: instr0 ; An instruction prior to the Repeat start instruction is regarded as a repeat detection instruction. RptStart: instr1 ; [Repeat start instruction] RptEnd: instr2 ; [Repeat end instruction] |
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