SH7721 datasheet(153/1524 Pages) RENESAS

153 / 1524 page

Section 3 DSP Operating Unit

Rev. 3.00 Jan. 18, 2008 Page 91 of 1458

REJ09B0033-0300

• Example 2: Repeat loop consisting of three instructions

LDRS RptDtct +4

; Sets (repeat detection instruction

address + 4) to the RS register

LDRE RptDtct +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 RptDtct +6; Sets (repeat detection instruction

address + 6) to the RS register

LDRE RptDtct +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]

SH7721 Datasheet(PDF) 153 Page - Renesas Technology Corp

SH7721 Datasheet(HTML) 153 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL