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ST9 数据表(PDF) 29 Page - STMicroelectronics |
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ST9 数据表(HTML) 29 Page - STMicroelectronics |
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29 / 146 page  29/146 ST9 USER GUIDE Figure 13 . Addressing via DPR0-3 3.1.7.4.1 Accessing the Page and the Offset in Assembler or C Language The assembly tools implement a set of operands which allows you to extract the components of a data address. The PAG operator (stands for PAGe) extracts the page number of an address; similarly, the POF operator (stands for Page OFfset) extracts the offset of the address within the page. Syntax: PAG label POF label Be careful that directly using the data label and using the POF operator on a data label are not equivalent: the data label gives the 16 bits of the logical label address; the POF operand gives the 14 lowest bits of the label’s physical or logical address. Example: Assuming data is mapped at address 0x129876: ldw rr2,#POF data ; rr2 = 0x1876 ldw rr4,#data ; rr4 = 0xD876 (with DPR3=0x4A) Remember that you must take care of which data pointer has to be set before accessing a variable. DPR0 DPR1 DPR2 DPR3 00 01 10 11 14 LSB 8 bits 22-bit Physical Address 16-bit Virtual Address MMU Registers |
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