Motorola MC68340 manual Example d 16 is a 16-bit displacement

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Besides the operation code, which specifies the function to be performed, an instruction defines the location of every operand for the function. Instructions specify an operand location in one of three ways:

•	Register Specification	A register field of the instruction contains the number of
		the register.
•	Effective Address	An effective address field of the instruction contains
		address mode information.
•	Implicit Reference	The definition of an instruction implies the use of
		specific registers.

The register field within an instruction specifies the register to be used. Other fields within the instruction specify whether the register is an address or data register and how it is to be used. The M68000PM/AD, M68000 Family Programmer’s Reference Manual, contains detailed register information.

Except where noted, the following notation is used in this section:

Data	Immediate data from an instruction
Destination	Destination contents
Source	Source contents
Vector	Location of exception vector
An	Any address register (A7–A0)
Ax, Ay	Address registers used in computation
Dn	Any data register (D7–D0)
Rc	Control register (VBR, SFC, DFC)
Rn	Any address or data register
Dh, Dl	Data registers, high- and low-order 32 bits of product
Dr, Dq	Data registers, division remainder, division quotient
Dx, Dy	Data registers, used in computation
Dym, Dyn	Data registers, table interpolation values
Xn	Index register
[An]	Address extension

ccCondition code

d# Displacement

〈ea〉	Example: d16 is a 16-bit displacement
	Effective address
#〈data〉	Immediate data; a literal integer
label	Assembly program label
list	List of registers
	Example: D3–D0
[...]	Bits of an operand
	Examples: [7] is bit 7; [31:24] are bits 31–24

MOTOROLAMC68340 USER’S MANUAL5- 13

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