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Usage of ldr, str, stm, ldm in arm assembly
Here we compare four instructions that are easy to confuse. We have spent a lot of effort on confusing these four instructions. Now let’s make a brief summary. For the instructions about LDM and STM, see another description file, which explains the precautions when using these two files for stack operations.
(1) LDR:
[Microcontroller]
The difference between B jump instruction and LDR jump in ARM assembly
The B jump instruction is independent of the code position. After assembly, it will be replaced by the current PC value plus (minus) a correction value. No matter which address this instruction is executed at, it can jump to the specified location.
B can only jump within the 32M range of the current PC, and LDR ca
[Microcontroller]
ARM immediate number explains the difference between LDR and MOV.
Mov is to assign an immediate value to a register, but there is a requirement for the range of the immediate value. It can only be a number that can be obtained by shifting 8 consecutive valid bits an even number of times. If the immediate value exceeds this range, there is no way to assign a value to the register usin
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