1. Shift Operation Instructions LSL, LSR, ASR, ROR, RRX
2. Instruction Condition Code
3. Memory Access Instructions
— LDR Word Data Load Instruction.<span>LDR</span><span> instruction is used to transfer a</span><span> 32</span><span>-bit word data from memory to the destination register. This instruction is usually used to read</span><span> 32</span><span>-bit word data into a general-purpose register for processing.</span>
— LDRB Byte Data Load Instruction.<span>LDRB</span><span> instruction is used to transfer an</span><span> 8</span><span>-bit byte data from memory to the destination register, while clearing the upper</span><span> 24</span><span> bits of the register. This instruction is usually used to read</span><span> 8</span><span>-bit byte data into a general-purpose register for processing.</span>
— LDRH Halfword Data Load Instruction.<span>LDRH</span><span> instruction is used to transfer a</span><span> 16</span><span>-bit halfword data from memory to the destination register, while clearing the upper</span><span> 16</span><span> bits of the register. This instruction is usually used to read</span><span> 16</span><span>-bit halfword data into a general-purpose register for processing.</span>
— STR Word Data Store Instruction.<span>STR</span><span> instruction is used to transfer a</span><span> 32</span><span>-bit word data from the source register to memory.</span>
— STRB Byte Data Store Instruction.<span>STRB</span><span> instruction is used to transfer an</span><span> 8</span><span>-bit byte data from the source register to memory.</span>
— STRH Halfword Data Store Instruction.<span>STRH</span><span> instruction is used to transfer a</span><span> 16</span><span>-bit halfword data from the source register to memory.</span>
4. Arithmetic Operation Instructions
5. Logic Operation Instructions
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AND |
Logical AND Operation Instruction |
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ORR |
Logical OR Operation Instruction |
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EOR |
Logical XOR Operation Instruction |
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BIC |
Bit Clear Instruction |
6. Other Common Instructions
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CMP |
Comparison Instruction |
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MUL |
32-bit Multiplication Instruction |
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B |
Branch Instruction |
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BL |
Branch with Link Instruction |
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SWI |
Software Interrupt Instruction SWI 12 |
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MRS |
Read Status Register Instruction MRS R0,CPSR |
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MSR |
Write Status Register Instruction MSR CPSR,R1 |
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DCB |
Used to allocate a contiguous block of memory and initialize with specified data |
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CODE16/CODE32 |
Tells the compiler the type of the following instructions |