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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST9 数据表(PDF) 30 Page - STMicroelectronics |
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ST9 数据表(HTML) 30 Page - STMicroelectronics |
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30 / 146 page  30/146 ST9 USER GUIDE Example: Assuming that data has been mapped in a page aligned on address 0xC000, this means that DPR3 will be used, therefore the following code is correct: ld DPR3,#PAG data ldw rr2,data ld r4,(rr2) In assembly language, it is possible to access data through another DPR: Example: Still using data at an address aligned with 0xC000, following code is correct: ld DPR2,#PAG data ; if data address=0x01C765, DPR2=7 ldw rr2, #(POF data)+0x8000; rr2=0x8765 ; #(POF data) to reset bit 15 and 14 ; and 0x8000 to use DPR2 ld r4,(rr2) ; indirect addressing mode ... ld r4, (POF data)+0x8000 ; direct addressing mode It is important to look at the explicit usage of the immediate addressing mode (#) to get the page number and the offset; it is consistent with the ST9 assembly syntax shown in the fol- lowing example: ldw rr2,#Var ld r4,(rr2) ... ld r4, Var The same functions exist in C language: PAG(data); POF(data); |
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