4571 datasheet(77/126 Pages) RENESAS

77 / 126 page

Rev.1.02

May 25, 2007

Page 77 of 124

REJ03B0179-0102

4571 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

LXY x,y

(Load register X and Y with x and y)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

11 x3 x2 x1 x0 y3 y2 y1 y0 2 3x y 16

Continuous

description

Opera-

tion:

(X)

← x x = 0 to 15

(Y)

← y y = 0 to 15

Grouping:

RAM addresses

Description: Loads the value x in the immediate field to register X, and

the value y in the immediate field to register Y. When the

LXY instructions are continuously coded and executed,

only the first LXY instruction is executed and other LXY

instructions coded continuously are skipped.

LZ z

(Load register Z with z)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

100

10 Z1 Z0 2 04

+z 16

Opera-

tion:

(Z)

← z z = 0 to 3

Grouping:

RAM addresses

Description: Loads the value z in the immediate field to register Z.

NOP

(No OPeration)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

000

00 2 00 0 16

Opera-

tion:

(PC)

← (PC) + 1

Grouping:

Other operation

Description: No operation; Adds 1 to program counter value, and others

remain unchanged.

OP0A

(Output port P0 from Accumulator)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

010

00 2 22 0 16

Opera-

tion:

(P0)

← (A)

Grouping:

Input/Output operation

Description: Outputs the contents of register A to port P0.

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