Section 2 CPU
Rev. 2.00 Mar 09, 2006 page 59 of 906
REJ09B0292-0200
Modulo Addressing:
The chip has a modulo addressing mode, just as other DSPs do. Address
registers are updated in the same manner as with other modes. When the address pointer value
becomes the same as a previously established modulo end address, the address pointer becomes
the modulo start address.
Modulo addressing is valid only with X, Y data transfer instructions (MOVX.W, MOVY.W).
When the DMX bit of the SR register is set, the X address register enters modulo addressing
mode; when the DMY bit of the SR register is set, the Y address register does so. Modulo
addressing is valid only for either the X or the Y address register; it is not possible to make them
both modulo addressing mode at the same time. Therefore, do not simultaneously set the DMX
and DMY. If they happen to be set at the same time, only the DMY side is valid.
The MOD register is used to designate the start and end addresses of the modulo address area; it
stores the MS (modulo start) and ME (modulo end). An example of MOD register (MS, ME)
usage is indicated below.
MOV.L ModAddr,Rn;
Rn=ModEnd, ModStart
LDC Rn,MOD;
ME=ModEnd, MS=ModStart
ModAddr:
.DATA.W
mEnd;
ModEnd
.DATA.W mStart;
ModStart
ModStart: .DATA
:
ModEnd:
.DATA
Designate the start and end addresses in MS and ME, and then set the DMX or DMY bit to 1. The
contents of the address register are compared with ME. If they match ME, the start address MS is
stored in the address register. The lower 16 bits of the address register are compared with ME. The
maximum modulo size is 64 kbytes. This is sufficient for X, Y data memory accesses. Figure 2.11
shows a block diagram of modulo 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 ...