17.37 LDRB (register)

Load Register Byte (register).

Syntax

LDRB Wt, [Xn|SP, (Wm|Xm), extend {amount}] ; Extended register general registers

LDRB Wt, [Xn|SP, Xm{, LSL amount}] ; Shifted register general registers

Where:

Wt
Is the 32-bit name of the general-purpose register to be transferred.
Xn|SP
Is the 64-bit name of the general-purpose base register or stack pointer.
Wm
When "option<0>" is set to 0, is the 32-bit name of the general-purpose index register.
Xm
When "option<0>" is set to 1, is the 64-bit name of the general-purpose index register.
extend
Is the index extend specifier, and can be one of the values shown in Usage.
amount
Is the index shift amount, it must be.

Usage

Load Register Byte (register) calculates an address from a base register value and an offset register value, loads a byte from memory, zero-extends it, and writes it to a register. For information about memory accesses, see Load/Store addressing modes in the ARM Architecture Reference Manual ARMv8, for ARMv8-A architecture profile.

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