MC68340 datasheet(158/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

5- 21

Table 5-3. Condition Code Computations (Continued)

Operations

Special Definition

ROR

—

∗∗

C = Dr – 1

ROR (r = 0)

—

∗∗

NOTE : The following notations apply to this table only.

—

Not affected

Source operand MSB

Undefined

Destination operand MSB

See special definition

Result operand MSB

∗

General case

Bit Number

Shift count

Λ ... Λ R0

Lower bound

Λ=

Boolean AND

Upper bound

Boolean OR

NOT Rm

5.3.3.2 DATA MOVEMENT INSTRUCTIONS. The MOVE instruction is the basic means of

transferring and storing address and data. MOVE instructions transfer byte, word, and

long-word operands from memory to memory, memory to register, register to memory,

and register to register. Address movement instructions (MOVE or MOVEA) transfer word

and long-word operands and ensure that only valid address manipulations are executed.

In addition to the general MOVE instructions, there are several special data movement

instructions—move multiple registers (MOVEM), move peripheral data (MOVEP), move

quick (MOVEQ), exchange registers (EXG), load effective address (LEA), push effective

address (PEA), link stack (LINK), and unlink stack (UNLK). Table 5-4 is a summary of the

data movement operations.

Table 5-4. Data Movement Operations

Instruction

Operand

Syntax

Operand Size

Operation

EXG

Rn, Rn

⇒ Rn

LEA

〈ea〉, An

〈ea〉 ⇒ An

LINK

An, #

〈d〉

16, 32

SP – 4

⇒ SP, An ⇒ (SP); SP ⇒ An, SP + d ⇒ SP

MOVE

〈ea〉, 〈ea〉

8, 16, 32

Source

⇒ Destination

MOVEA

〈ea〉, An

16, 32

⇒ 32

Source

⇒ Destination

MOVEM

list,

〈ea〉

〈ea〉, list

16, 32

⇒ 32

Listed registers

⇒ Destination

Source

⇒ Listed registers

MOVEP

Dn, (d16, An)

(d 16, An), Dn

16, 32

Dn [31:24]

⇒ (An + d); Dn [23:16] ⇒ (An + d + 2);

Dn [15:8]

⇒ (An + d + 4); Dn [7:0] ⇒ (An + d + 6)

(An + d)

⇒ Dn [31:24]; (An + d + 2) ⇒ Dn [23:16];

(An + d + 4)

⇒ Dn [15:8]; (An + d + 6) ⇒ Dn [7:0]

MOVEQ

〈data〉, Dn

⇒ 32

Immediate Data

⇒ Destination

PEA

〈ea〉

SP – 4

⇒ SP; 〈ea〉 ⇒ SP

UNLK

⇒ SP; (SP) ⇒ An, SP + 4 ⇒ SP

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