PM0215 datasheet(49/91 Pages) STMICROELECTRONICS

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PM0215

The STM32 Cortex-M0 instruction set

Doc ID 022979 Rev 1

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3.5.1

ADD{S}, ADCS, SUB{S}, SBCS, and RSBS

Add, add with carry, subtract, subtract with carry, and reverse subtract.

Syntax

ADCS

{Rd,} Rn, Rm

ADD{S} {Rd,} Rn, <Rm|#imm>

RSBS

{Rd,} Rn, Rm, #0

SBCS

{Rd,} Rn, Rm

SUB{S} {Rd,} Rn, <Rm|#imm>

where:

●

S: causes an ADD or SUB instruction to update flags

●

Rd: specifies the result register. If omitted,this value is assumed to take the same value

as Rn, for example ADDS R1,R2 is identical to ADDS R1,R1,R2.

●

Rn: specifies the first source register

●

Rm: specifies the second source register

●

imm: specifies a constant immediate value.

Operation

The ADCS instruction adds the value in Rn to the value in Rm, adding a further one if the

carry flag is set, places the result in the register specified by Rd and updates the N, Z, C,

and V flags.

The ADD instruction adds the value in Rn to the value in Rm or an immediate value

specified by imm and places the result in the register specified by Rd.

The ADDS instruction performs the same operation as ADD and also updates the N, Z, C

and V flags.

The RSBS instruction subtracts the value in Rn from zero, producing the arithmetic negative

of the value, and places the result in the register specified by Rd and updates the N, Z, C

and V flags.

The SBCS instruction subtracts the value of Rm from the value in Rn, deducts a further one

if the carry flag is set. It places the result in the register specified by Rd and updates the N,

Z, C and V flags.

The SUB instruction subtracts the value in Rm or the immediate specified by imm. It places

the result in the register specified by Rd.

The SUBS instruction performs the same operation as SUB and also updates the N, Z, C

and V flags.

Use ADC and SBC to synthesize multiword arithmetic (see Multiword arithmetic examples

on page 50 and ADR on page 42).

Restrictions

Table 20 lists the legal combinations of register specifiers and immediate values that can be

used with each instruction.

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