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PM0223 数据表(PDF) 49 Page - STMicroelectronics |
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PM0223 数据表(HTML) 49 Page - STMicroelectronics |
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49 / 110 page  DocID025763 Rev 1 49/110 PM0223 The STM32L0 Cortex-M0+ Instruction Set 80 3.4.4 LDR, PC-relative Load register (literal) from memory. Syntax LDR Rt, label where: Operation Loads the register specified by Rt from the word in memory specified by label. Restrictions In these instructions, label must be within 1020 bytes of the current PC and word aligned. Condition flags These instructions do not change the flags. Examples LDR R0, LookUpTable ; Load R0 with a word of data from an address ; labelled as LookUpTable. LDR R3, [PC, #100] ; Load R3 with memory word at (PC + 100). Rt Is the register to load label Is a PC-relative expression. See 3.3.5: PC-relative expressions on page 42. |
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