4552 Datasheet, PDF(109/145 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4552 Datasheet, PDF (109/145 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4552 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

WRST (Watchdog timer ReSeT)

Instruction

code

Number of Number of Flag CY

1010100000

2 A0

words

cycles

Skip condition

(WDF1) = 1

Operation:

(WDF1) = 1 ?

(WDF1) â 0

Grouping: Other operation

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

next instruction when watchdog timer flag

WDF1 is â1.â When the WDF1 flag is â0,â ex-

ecutes 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)

Instruction D9

Number of Number of Flag CY

code

words

cycles

101101j

Skip condition

Operation:

(A) ââ (M(DP))

(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 regis-

ter 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)

Instruction D9

Number of Number of Flag CY

code

words

cycles

101111j

Skip condition

(Y) = 15

Operation:

(A) ââ (M(DP))

(X) â (X)EXOR(j)

Grouping: RAM to register transfer

Description: After exchanging the contents of M(DP)

with the contents of register A, an exclusive

j = 0 to 15

(Y) â (Y) â 1

OR operation is performed between regis-

ter 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 con-

tents of register Y is 15, the next instruction

is skipped. When the contents of register Y

is not 15, the next instruction is executed.

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

Instruction D9

Number of Number of Flag CY

code

101110j j j j

2 Ej

words

cycles

Skip condition

(Y) = 0

Operation:

(A) ââ (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 regis-

ter 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 re-

sult of addition, when the contents of

skipped. when the contents of register Y is

not 0, the next instruction is executed.

Rev.3.02 Dec 22, 2006 page 109 of 142

REJ03B0023-0302

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