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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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PM0215 数据表(PDF) 42 Page - STMicroelectronics |
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PM0215 数据表(HTML) 42 Page - STMicroelectronics |
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42 / 91 page  The STM32 Cortex-M0 instruction set PM0215 42/91 Doc ID 022979 Rev 1 3.4.1 ADR Load PC-relative address. Syntax ADR Rd, label where: ● ‘Rd’ is the destination register ● ‘label’ is a PC-relative expression (see PC-relative expressions on page 39) Operation ADR determines the address by adding an immediate value to the PC. It writes the result to the destination register. ADR produces position-independent code, because the address is PC-relative. If you use ADR to generate a target address for a BX or BLX instruction, you must ensure that bit[0] of the address you generate is set to1 for correct execution. Restrictions Rd must specify R0-R7. The data-value addressed must be word aligned and within 1020 bytes of the current PC. Condition flags This instruction does not change the flags. Examples ADR R1, TextMessage ; write address value of a location labelled as ; TextMessage to R1 ADR R3, [PC,#996] ; Set R3 to value of PC + 996. |
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