Section 2 CPU
Rev. 2.00 Mar 09, 2006 page 58 of 906
REJ09B0292-0200
Single Data Addressing:
Among the DSP instructions, the single data transfer instructions
(MOVS.W and MOVS.L) are used to either load data into DSP registers or to store it from them.
With these instructions, the registers R2 to R5 are used as address registers (As) for the single data
transfers.
The four following data addressing instructions exist for single data transfer instructions.
1. Non-updated address registers: The As registers are address pointers. They are not updated.
2. Add index registers: The As registers are address pointers. The Is register values are added to
them after the data transfer (post-update).
3. Increment address registers: The As registers are address pointers. The value +2 or +4 is added
after the data transfer (post-update).
4. Decrement address registers: The As registers are address pointers. The value –2 or –4 is added
(+2 or +4 is subtracted) before the data transfer (pre-update).
The address pointer (As) uses the R8 register as an index register (Is).
Figure 2.10 shows the single data transfer addressing.
ALU
R8[Is]
R4[As]
R5[As]
+2/+4 (INC)
+0 (No update)
Note: There are four addressing methods (no update, index register addition (Is),
increment, and decrement). Index register addition and increment are
post-updating methods. Decrement is a pre-updating method.
R3[As]
R2[As]
–2/–4 (DEC)
31
31
0
31
0
0
MAB
CAB
Figure 2.10 Single Data Transfer Addressing
Содержание SH7616
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Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...