ARM instruction set LDR instruction-EEWORLD

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In the ARM instruction set, LDR is usually used as a load instruction, but it can also be used as a pseudo-instruction.

(1) LDR r0,=name. This instruction with an equal sign is a pseudo-instruction, not an ARM instruction. The LDR pseudo-instruction is used to load an immediate value or an address value into a specified register.
*If name is an immediate value: LDR R0,=0X123; //Store 0X123 in R0
*If name is an identifier: LDR R0,=NAME; //Store the address of NAME in R0
Equivalent to:
LDR R0,LABEL;
LABEL DCB NAME; //Allocate memory and initialize it with NAME (LABEL is the starting address of the memory?)

(2) LDR R1,[R0]; If there is no equal sign, the LDR instruction is used to read data from the memory and put it into a register. This instruction reads the data at the address R0 and saves it in R1 (zero offset).

Keywords：ARM Reference address：ARM instruction set LDR instruction

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