4559 datasheet(120/148 Pages) RENESAS

120 / 148 page

Rev.1.04

Aug 23, 2007

Page 120 of 146

REJ03B0188-0104

4559 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

XAM j

(eXchange Accumulator and Memory data)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera-

tion:

(A)

← → (M(DP))

(X)

← (X)EXOR(j)

j = 0 to 15

Grouping:

RAM to register transfer

Description: After exchanging the contents of M(DP) with the contents

of register A, an exclusive OR operation is performed

between register X and the value j in the immediate field,

and stores the result in register X.

XAMD j

(eXchange Accumulator and Memory data and Decrement register Y and skip)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

(Y) = 15

Opera-

tion:

(A)

← → (M(DP))

(X)

← (X)EXOR(j)

j = 0 to 15

(Y)

← (Y) −1

Grouping:

RAM to register transfer

Description: After exchanging the contents of M(DP) with the contents

of register A, an exclusive OR operation is performed

between register X and the value j in the immediate field,

and stores the result in register X.

Subtracts 1 from the contents of register Y.

As a result of subtraction, when the contents of register Y

is 15, the next instruction is skipped. When the contents of

XAMI j

(eXchange Accumulator and Memory data and Increment register Y and skip)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

(Y) = 0

Opera-

tion:

(A)

← → (M(DP))

(X)

← (X)EXOR(j)

j = 0 to 15

(Y)

← (Y) + 1

Grouping:

RAM to register transfer

Description: After exchanging the contents of M(DP) with the contents

of register A, an exclusive OR operation is performed

between register X and the value j in the immediate field,

and stores the result in register X.

Adds 1 to the contents of register Y. As a result of addition,

when the contents of register Y is 0, the next instruction is

skipped. When the contents of register Y is not 0, the next

instruction is executed.

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