PM0223 datasheet(59/110 Pages) STMICROELECTRONICS

No de pièce	PM0223

Description	This programming manual provides information for application and system-level software developers

PDF	110 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

Logo

59 / 110 page

DocID025763 Rev 1

59/110

PM0223

The STM32L0 Cortex-M0+ Instruction Set

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:

–

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

Is the register holding the first operand.

Is the register to compare with.

Imm

Is the immediate value to compare with.

PM0223 Fiches technique(PDF) 59 Page - STMicroelectronics

PM0223 Fiches technique(HTML) 59 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Fiches technique Télécharger

Lien URL