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Section 3 DSP Operation
Rev. 4.00 Sep. 14, 2005 Page 125 of 982
REJ09B0023-0400
#imm is 8 bits while RC is 12 bits. Therefore, to set more than 256 into RC, use Rm. A sample
program is shown below.
LDRS RptStart;
LDRE 4;
SETRC #imm; RC = #imm
instr0;
; instr1–5 executes repeatedly
RptStart: instr1;
RptEnd3: instr2;
instr3;
instr4;
RptEnd: instr5;
instr6;
In this implementation, there are some restrictions to use this repeat control function as follows:
1. There must be at least one instruction between SETRC and the first instruction in a repeat
loop.
2. LDRS and LDRE must be executed before SETRC.
3. In a case that the repeat loop has four or more instructions in it, stall cycles are necessary
according to the pipeline state at execution.
4. If a repeat loop has less than four instructions in it, it cannot have any branch instructions
(BRA, BSR, BT, BF, BT/S, BF/S, BSRF, RTS, BRAF, RTE, JSR and JMP), repeat control
instructions (SETRC, LDRS and LDRE), load instructions for SR, RS, RE, and a TRAPA
instruction in it. If these instructions are executed, a general invalid instruction exception
handling starts, and a certain address value shown in table 3.15 is stored into SPC.
Table 3.15 Address Value to be Stored into SPC (1)
Condition
Location
Address to be Pushed
RC
≥
2
Any
RptStart
RC = 1
Any
Address of the illegal instruction
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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