CPU instructions (CPU Instructions STL module)

General Description

The CPU instruction self-test verifies correct operation of core CPU/ALU instructions, such as arithmetic, logic, shift, and bit manipulation instructions.

The test executes a sequence of representative instructions and checks their results against expected values. If any instruction produces an unexpected result, the test fails.

More Information

The self-test covers the following CPU instructions:

• ADD, SUB: Arithmetic addition and subtraction
• AND, ORR, EOR: Bitwise logical operations (AND, OR, XOR)
• MOV, MVN: Move and bitwise NOT
• LSL, LSR, ASR: Logical/arithmetic shift left/right
• CMP, CMN: Compare and compare negative
• ADC, SBC: Add with carry, subtract with carry
• ROR: Rotate right
• BIC: Bit clear
• REV: Byte order reversal
• CLZ: Count leading zeros

Note

The CLZ (Count Leading Zeros) instruction is not supported in Thumb code; only Thumb-2 cores support it. The test for CLZ is only executed if the core supports it.

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