HCS12 datasheet(61/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.8 Decrement and Increment Instructions

The decrement and increment instructions are optimized 8- and 16-bit

addition and subtraction operations. They are generally used to implement

counters. Because they do not affect the carry bit in the CCR, they are

particularly well suited for loop counters in multiple-precision computation

routines. Refer to 5.20 Loop Primitive Instructions for information

concerning automatic counter branches. Table 5-6 is a summary of

decrement and increment instructions.

Table 5-6. Decrement and Increment Instructions

Mnemonic

Function

Operation

Decrement Instructions

DEC

Decrement memory

(M) – $01

⇒ M

DECA

Decrement A

(A) – $01

⇒ A

DECB

Decrement B

(B) – $01

⇒ B

DES

Decrement SP

(SP) – $0001

⇒ SP

DEX

Decrement X

(X) – $0001

⇒ X

DEY

Decrement Y

(Y) – $0001

⇒ Y

Increment Instructions

INC

Increment memory

(M)

+ $01 ⇒ M

INCA

Increment A

(A)

+ $01 ⇒ A

INCB

Increment B

(B)

+ $01 ⇒ B

INS

Increment SP

(SP)

+ $0001 ⇒ SP

INX

Increment X

(X)

+ $0001 ⇒ X

INY

Increment Y

(Y)

+ $0001 ⇒ Y

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