HCS12 datasheet(100/452 Pages) FREESCALE

100 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

100

Freescale Semiconductor

Operation:

(A) + (B)

⇒ A

Description:

Adds the content of accumulator B to the content of accumulator A and

places the result in A. The content of B is not changed. This instruction

affects the H status bit so it is suitable for use in BCD arithmetic operations.

See DAA instruction for additional information.

ABA

Add Accumulator B to Accumulator A

ABA

CCR Details:

HIN

––

∆

–

∆∆∆∆

H: A3

• B3 + B3 • R3 + R3 • A3

Set if there was a carry from bit 3; cleared otherwise

N: Set if MSB of result is set; cleared otherwise

Z: Set if result is $00; cleared otherwise

V: A7

• B7 • R7 + A7 • B7 • R7

Set if a two’s complement overﬂow resulted from the operation;

cleared otherwise

C: A7

• B7 + B7 • R7 + R7 • A7

Set if there was a carry from the MSB of the result; cleared

otherwise

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

ABA

INH

18 06

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