DP8344 datasheet(146/184 Pages) NSC

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60 Reference Section (Continued)

MOVE

Move Data Memory

Syntax

MOVE

mIr

indexed register

MOVE

IraA

MOVE

IZan

immediate-relative limited register

Affected Flags

None

Description

Moves a data memory byte into the destination register

specified The data memory source operand may specify

any one of the index register modes mIr

IraA

IZan

The index register-relative mode

IraA

forms its data

memory address by adding the contents of the index regis-

ter Ir to the unsigned 8-bit value contained in the currently

active accumulator The immediate-relative mode

IZan

forms its data memory address by adding the contents of

the index register IZ to the unsigned 8-bit immediate value

n The destination register operand Rd may specify any ac-

tive CPU register where as the destination register operand

rd is limited to the active registers R0 – R15

Example

The first example loads the current accumulator by ‘‘pop-

ping’’ an external data stack which is pointed to by the

index register IX

MOVE

pop accum from ext stack

The second example demonstrates the random access of a

data byte within a logical record contained in memory The

index register IY contains the base address of the logical

record

ADDA

R9 A

calculate offset into record

MOVE

IYaA

R20

get data byte from record

In the final example the 4th element of an Error Count table

is transmitted to a host The index register IZ points to the

1st entry of the table

EXX

select main A alt B

MOVE

IZa3

RTR

transmit 4th element

Instruction Format

MOVE

mIr

TLF9336 – 9

MOVE

IraA

110001000

Opcode

00IW

01IX

10IY

11IZ

MOVE

IZan

1001

Opcode

T-states

3 4TR e 0

4 4TR e 1

Bus Timing

Figure 6-5 4TR e 0

Figure 6-6 4TR e 1

Operation

MOVE

mIr

data memory

xRd

MOVE

IraA

data memory

xRd

MOVE

IZan

data memory

xrd

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