HCS12 datasheet(60/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.7 Binary-Coded Decimal Instructions

To add binary-coded decimal (BCD) operands, use addition instructions that

set the half-carry bit in the CCR, then adjust the result with the decimal

adjust A (DAA) instruction. Table 5-5 is a summary of instructions that can

be used to perform BCD operations.

Table 5-5. BCD Instructions

Mnemonic

Function

Operation

ABA

Add B to A

(A)

+ (B) ⇒ A

ADCA

Add with carry to A

(A)

+ (M) + C ⇒ A

ADCB(1)

1. These instructions are not normally used for BCD operations because, although they affect H

correctly, they do not leave the result in the correct accumulator (A) to be used with the DAA

instruction. Thus additional steps would be needed to adjust the result to correct BCD form.

Add with carry to B

(B)

+ (M) + C ⇒ B

ADDA(1)

Add memory to A

(A)

+ (M) ⇒ A

ADDB

Add memory to B

(B)

+ (M) ⇒ B

DAA

Decimal adjust A

(A)10

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