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PM0223 bảng dữ liệu(PDF) 59 Page - STMicroelectronics

tên linh kiện PM0223
Giải thích chi tiết về linh kiện  This programming manual provides information for application and system-level software developers
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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PM0223 bảng dữ liệu(HTML) 59 Page - STMicroelectronics

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PM0223
The STM32L0 Cortex-M0+ Instruction Set
80
3.5.4
CMP and CMN
Compare and Compare Negative.
Syntax
CMN Rn, Rm
CMP Rn, #imm
CMP Rn, Rm
where:
Operation
These instructions compare the value in a register with either the value in another register or
an immediate value. They update the condition flags on the result, but do not write the result
to a register.
The CMP instruction subtracts either the value in the register specified by Rm, or the
immediate imm from the value in Rn and updates the flags. This is the same as a SUBS
instruction, except that the result is discarded.
The CMN instruction adds the value of Rm to the value in Rn and updates the flags. This is the
same as an ADDS instruction, except that the result is discarded.
Restrictions
For the:
•
CMN
instruction Rn, and Rm must only specify R0-R7.
•
CMP
instruction:
–
Rn
and Rm can specify R0-R14.
–
Immediate must be in the range 0-255.
Condition flags
These instructions update the N, Z, C and V flags according to the result.
Examples
CMP
R2, R9
CMN
R0, R2
Rn
Is the register holding the first operand.
Rm
Is the register to compare with.
Imm
Is the immediate value to compare with.



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