4553 datasheet(109/145 Pages) RENESAS

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Rev.3.02

Dec 22, 2006

page 109 of 142

REJ03B0024-0302

4553 Group

WRST (Watchdog timer ReSeT)

1010100000

–

(WDF1) = 1

Grouping:

Other operation

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

next instruction when watchdog timer flag

WDF1 is “1.” When the WDF1 flag is “0,” ex-

ecutes the next instruction. Also, stops the

watchdog timer function when executing the

WRST instruction immediately after the

DWDT instruction.

Operation:

(WDF1) = 1 ?

(WDF1)

← 0

XAM j (eXchange Accumulator and Memory data)

101101

jjjj

–

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.

Operation:

(A)

←→ (M(DP))

(X)

← (X)EXOR(j)

j = 0 to 15

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

101111

jjjj

–

(Y) = 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.

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.

Operation:

(A)

←→ (M(DP))

(X)

← (X)EXOR(j)

j = 0 to 15

(Y)

← (Y) – 1

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

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

101110

jjjj

–

(Y) = 0

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.

Operation:

(A)

←→ (M(DP))

(X)

← (X)EXOR(j)

j = 0 to 15

(Y)

← (Y) + 1

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