455A Datasheet, PDF(94/148 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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455A Datasheet, PDF (94/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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455A Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

LXY x,y (Load register X and Y with x and y)

Instruc-

tion

Number of Number of

words

cycles

Flag CY

Skip condition

code

1 1 x3 x2 x1 x0 y3 y2 y1 y0 2 3 x y 16

Continuous

description

Opera- (X) â x x = 0 to 15

tion: (Y) â 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

0 Z1 Z0 2

+z 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (Z) â z z = 0 to 3

tion:

Grouping: RAM addresses

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

NOP (No OPeration)

Instruc-

tion

code

0 0 0 0 0 0 0 0 0 0 2 0 0 0 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (PC) â (PC) + 1

tion:

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

1 0 0 0 1 0 0 0 0 0 2 2 2 0 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (P0) â (A)

tion:

Grouping: Input/Output operation

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

Rev.1.01 Feb 15, 2008 Page 94 of 146

REJ03B0224-0101

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