HCS12 datasheet(63/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.10 Boolean Logic Instructions

The Boolean logic instructions perform a logic operation between an 8-bit

accumulator or the CCR and a memory value. AND, OR, and exclusive OR

functions are supported. Table 5-8 summarizes logic instructions.

5.11 Clear, Complement, and Negate Instructions

Each of the clear, complement, and negate instructions performs a specific

binary operation on a value in an accumulator or in memory. Clear

operations clear the value to 0, complement operations replace the value

with its one’s complement, and negate operations replace the value with its

two’s complement. Table 5-9 is a summary of clear, complement, and

negate instructions.

Table 5-8. Boolean Logic Instructions

Mnemonic

Function

Operation

ANDA

AND A with memory

(A)

• (M) ⇒ A

ANDB

AND B with memory

(B)

• (M) ⇒ B

ANDCC

AND CCR with memory (clear CCR bits)

(CCR)

• (M) ⇒ CCR

EORA

Exclusive OR A with memory

(A)

⊕ (M) ⇒ A

EORB

Exclusive OR B with memory

(B)

⊕ (M) ⇒ B

ORAA

OR A with memory

(A)

+ (M) ⇒ A

ORAB

OR B with memory

(B)

+ (M) ⇒ B

ORCC

OR CCR with memory (set CCR bits)

(CCR)

+ (M) ⇒ CCR

Table 5-9. Clear, Complement, and Negate Instructions

Mnemonic

Function

Operation

CLC

Clear C bit in CCR

⇒ C

CLI

Clear I bit in CCR

⇒ I

CLR

Clear memory

$00

⇒ M

CLRA

Clear A

$00

⇒ A

CLRB

Clear B

$00

⇒ B

CLV

Clear V bit in CCR

⇒ V

COM

One’s complement memory

$FF – (M)

⇒ M or (M) ⇒ M

COMA

One’s complement A

$FF – (A)

⇒ A or (A) ⇒ A

COMB

One’s complement B

$FF – (B)

⇒ B or (B) ⇒ B

NEG

Two’s complement memory

$00 – (M)

⇒ M or (M) + 1 ⇒ M

NEGA

Two’s complement A

$00 – (A)

⇒ A or (A) + 1 ⇒ A

NEGB

Two’s complement B

$00 – (B)

⇒ B or (B) + 1 ⇒ B

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