4556 datasheet(90/145 Pages) RENESAS

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Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Rev.3.02

Dec 22, 2006

page 90 of 142

REJ03B0025-0302

4556 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

SEAM (Skip Equal, Accumulator with Memory)

0000100110

026

–

(A) = (M(DP))

Grouping:

Comparison operation

Description: Skips the next instruction when the con-

tents of register A is equal to the contents of

M(DP).

Executes the next instruction when the con-

tents of register A is not equal to the

contents of M(DP).

Operation:

(A) = (M(DP)) ?

SNZ0 (Skip if Non Zero condition of external 0 interrupt request flag)

0000111000

038

–

V10 = 0: (EXF0) = 1

Grouping:

Interrupt operation

Description: When V10 = 0 : Clears (0) to the EXF0 flag

and skips the next instruction when external

0 interrupt request flag EXF0 is “1.” When

the EXF0 flag is “0,” executes the next in-

struction.

When V10 = 1 : This instruction is equiva-

lent to the NOP instruction.

Operation:

V10 = 0: (EXF0) = 1 ?

(EXF0)

← 0

V10 = 1: SNZ0 = NOP

(V10 : bit 0 of the interrupt control register V1)

SEA n (Skip Equal, Accumulator with immediate data n)

0000100101

025

–

(A) = n

n = 0 to 15

Grouping:

Comparison operation

Description: Skips the next instruction when the con-

tents of register A is equal to the value n in

the immediate field.

Executes the next instruction when the con-

tents of register A is not equal to the value n

in the immediate field.

Operation:

(A) = n ?

n = 0 to 15

000111nnnn

07n

SD (Set port D specified by register Y)

0000010101

–

Grouping:

Input/Output operation

Description: Sets (1) to a bit of port D specified by regis-

ter Y.

Operation:

(D(Y))

← 1

(Y) = 0 to 7

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