4571 Datasheet, PDF(102/126 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4571 Datasheet, PDF (102/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4571 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

WRST (Watchdog timer ReSeT)

Instruc-

tion

code

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

Number of

words

Number of

cycles

Flag CY

Skip condition

(WDF1) = 1

Opera- (WDF1) = 1 ?

tion: (WDF1) â 0

Grouping: Other operation

Description: Clears (0) to the WDF1 flag and skips the next instruction

when watchdog timer flag WDF1 is â1â. When the WDF1

flag is â0â, executes the next instruction. Also, stops the

watchdog timer function when executing the WRST

instruction immediately after the DWDT instruction.

XAM j (eXchange Accumulator and Memory data)

Instruc-

tion

code

1 0 1 1 0 1 j j j j 2 2 D j 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (A) â â (M(DP))

tion: (X) â (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-

Number of

tion

words

code

1 0 1 1 1 1 j j j j 2 2 F j 16

Number of

cycles

Flag CY

Skip condition

(Y) = 15

Opera-

tion:

(A) â â (M(DP))

(X) â (X)EXOR(j)

j = 0 to 15

(Y) â (Y) â1

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-

Number of

tion

words

code

1 0 1 1 1 0 j j j j 2 2 E j 16

Number of

cycles

Flag CY

Skip condition

(Y) = 0

Opera-

tion:

(A) â â (M(DP))

(X) â (X)EXOR(j)

j = 0 to 15

(Y) â (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.

Rev.1.02 May 25, 2007 Page 102 of 124

REJ03B0179-0102

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