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Section 2 CPU
Rev. 4.00 Sep. 14, 2005 Page 30 of 982
REJ09B0023-0400
On the other hand, registers R2 to R9 are also used for DSP data address calculation when DSP
extension is enabled (see figure 2.4). Other symbols that represent the purpose of the registers in
DSP type instructions is shown in [ ].
31
R0
R1
R2 [As]
R3 [As]
R4 [As, Ax]
R5 [As, Ax]
R6 [Ay]
R7 [Ay]
R8 [Ix, Is]
R9 [Iy]
R10
R11
R12
R13
R14
R15
0
General Registers (DSP mode enabled)
X or Y data transfer operation
R4, 5 [Ax]: Address register set for X data memory.
R8 [x]:
Index register for address register set Ax.
R6, 7 [Ay]: Address register set for Y data memory.
R9 [Iy]:
Index register for address register set Ay.
Single data transfer operation
R2 to 5 [As]: Address register set for memory.
R8 [Is]:
Index register for address register set As.
Figure 2.4 General Registers (DSP Mode)
DSP type instructions can access X and Y data memory simultaneously. To specify addresses for
X and Y data memory, two address pointer sets are provided. These are:
R8[Ix], R4,5[Ax] for X memory access, and R9[Iy], R6,7[Ay] for Y memory access.
The symbols R2 to R9 are used by the assembler, but users can use other register names (aliases)
that indicate the purpose of the register in the DSP instruction. The coding in assembler is as
follows.
Ix:
.REG (R8)
The name Ix is the alias for R8. Other aliases are as follows.
Ax0: .REG (R4)
Ax1: .REG (R5)
Ix:
.REG
(R8)
Ay0: .REG (R6)
Содержание HD6417641
Страница 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
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Страница 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
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Страница 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Страница 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Страница 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Страница 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Страница 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Страница 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Страница 500: ...Section 13 Direct Memory Access Controller DMAC Rev 4 00 Sep 14 2005 Page 450 of 982 REJ09B0023 0400...
Страница 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Страница 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Страница 734: ...Section 18 Multi Function Timer Pulse Unit MTU Rev 4 00 Sep 14 2005 Page 684 of 982 REJ09B0023 0400...
Страница 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Страница 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Страница 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Страница 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Страница 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Страница 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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Страница 1036: ...SH7641 Hardware Manual...