HCS12 datasheet(59/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.6 Addition and Subtraction Instructions

Signed and unsigned 8- and 16-bit addition can be performed between

registers or between registers and memory. Special instructions support

index calculation. Instructions that add the carry bit in the condition code

Signed and unsigned 8- and 16-bit subtraction can be performed between

registers or between registers and memory. Special instructions support

index calculation. Instructions that subtract the carry bit in the CCR facilitate

multiple precision computation. Refer to Table 5-4 for addition and

subtraction instructions.

Load effective address (LEAS, LEAX, and LEAY) instructions could also be

considered as specialized addition and subtraction instructions. See 5.25

Pointer and Index Calculation Instructions for more information.

Table 5-4. Addition and Subtraction Instructions

Mnemonic

Function

Operation

Addition Instructions

ABA

Add B to A

(A)

+ (B) ⇒ A

ABX

Add B to X

(B)

+ (X) ⇒ X

ABY

Add B to Y

(B)

+ (Y) ⇒ Y

ADCA

Add with carry to A

(A)

+ (M) + C ⇒ A

ADCB

Add with carry to B

(B)

+ (M) + C ⇒ B

ADDA

Add without carry to A

(A)

+ (M) ⇒ A

ADDB

Add without carry to B

(B)

+ (M) ⇒ B

ADDD

Add to D

:B) + (M : M + 1) ⇒ A : B

Subtraction Instructions

SBA

Subtract B from A

(A) – (B)

⇒ A

SBCA

Subtract with borrow from A

(A) – (M) – C

⇒ A

SBCB

Subtract with borrow from B

(B) – (M) – C

⇒ B

SUBA

Subtract memory from A

(A) – (M)

⇒ A

SUBB

Subtract memory from B

(B) – (M)

⇒ B

SUBD

Subtract memory from D (A

:B)

(D) – (M

: M + 1) ⇒ D

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