4518 datasheet(127/160 Pages) RENESAS

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Rev.3.01

2005.06.15

page 127 of 157

REJ03B0008-0301

4518 Group

WRST (Watchdog timer ReSeT)

1010100000

–

(WDF1) = 1

Grouping:

Other operation

Description: Skips the next instruction when watchdog

timer flag WDF1 is “1.” After skipping, clears

(0) to the WDF1 flag. When the WDF1 flag

is “0,” executes the next instruction. Also,

stops the watchdog timer function when ex-

ecuting the WRST instruction immediately

after the DWDT instruction.

Operation:

(WDF1) = 1 ?

After skipping, (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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