andi.md

ANDI - AND immediate

Operation

[destination] ← <literal>.[destination]

Syntax

ANDI #<data>,<ea>

Attributes

Size byte, word, longword

Description

AND the immediate data to the destination operand. The ANDI permits a literal operand to be ANDed with a destination other than a data register. For example, ANDI #$FE00,$1234 or ANDI.B #$F0,(A2)+.

Condition codes

X	N	Z	V	C
-	*	*	0	0

Destination operand addressing modes

Dn	An	(An)	(An)+	‑(An)	(d,An)	(d,An,Xi)	ABS.W	ABS.L	(d,PC)	(d,PC,Xn)	imm
✓		✓	✓	✓	✓	✓	✓	✓

ANDI to CCR - AND immediate to condition code register

Operation

[CCR] ← <data>.[CCR]

Syntax

ANDI #<data>,CCR

Attributes

Size byte

Description

AND the immediate data to the condition code register (i.e., the least-significant byte of the status register).

Application

ANDI is used to clear selected bits of the CCR. For example, ANDI #$FA,CCR clears the Z- and C-bits, i.e., XNZVC = X N 0 V 0.

Condition codes

X	N	Z	V	C
*	*	*	*	*

• X: cleared if bit 4 of data is zero
• N: cleared if bit 3 of data is zero
• Z: cleared if bit 2 of data is zero
• V: cleared if bit 1 of data is zero
• C: cleared if bit 0 of data is zero

ANDI to SR - AND immediate to status register

Operation

IF [S] = 1
  THEN
    [SR] ← <literal>.[SR]
  ELSE TRAP

Syntax

ANDI #<data>,SR

Attributes

Size word

Description

AND the immediate data to the status register and store the result in the status register. All bits of the SR are affected.

Application

This instruction is used to clear the interrupt mask, the S-bit, and the T-bit of the SR. ANDI #<data>,SR affects both the status byte of the SR and the CCR. For example, ANDI #$7FFF,SR clears the trace bit of the status register, while ANDI #$7FFE,SR clears the trace bit and also clears the carry bit of the CCR.

Condition codes

X	N	Z	V	C
*	*	*	*	*

From MOTOROLA M68000 FAMILY Programmer's reference manual. Copyright 1992 by Motorola Inc./NXP. Adapted with permission.