4571 datasheet(83/126 Pages) RENESAS

83 / 126 page

Rev.1.02

May 25, 2007

Page 83 of 124

REJ03B0179-0102

4571 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

SEA n

(Skip Equal, Accumulator with immediate data n)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

010

01 2 02 5 16

(A) = n

n = 0 to 15

111

nn 2 07 n 16 Grouping:

Comparison operation

Description: Skips the next instruction when the contents of register A is

equal to the value n in the immediate field.

Executes the next instruction when the contents of register

A is not equal to the value n in the immediate field.

Opera-

tion:

(A) = n ?

n = 0 to 15

SEAM

(Skip Equal, Accumulator with Memory)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

010

10 2 02 6 16

(A) = (M(DP))

Opera-

tion:

(A) = (M(DP)) ?

Grouping:

Comparison operation

Description: Skips the next instruction when the contents of register A is

equal to the contents of M(DP).

Executes the next instruction when the contents of register

A is not equal to the contents of M(DP).

SNZ0

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

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

011

00 2 03 8 16

V10 = 0 : (EXF0) = 1

Opera-

tion:

V10 = 0 : (EXF0) = 1 ?

(EXF0)

← 0

V10 = 1 : SNZ0 = NOP

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

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

instruction.

When V10 = 1 : This instruction is equivalent to the NOP

instruction.

SNZ1

(Skip if Non Zero condition of external interrupt 1 request flag)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

011

01 2 03 9 16

V11 = 0 : (EXF1) = 1

Opera-

tion:

V11 = 0 : (EXF1) = 1 ?

(EXF1)

← 0

V11 = 1 : SNZ1 = NOP

(V11 : bit 1 of the interrupt control register V1)

Grouping:

Interrupt operation

Description: When V11 = 0 : Clears (0) to the EXF1 flag and skips the

next instruction when external 1 interrupt request flag

EXF1 is “1”. When the EXF1 flag is “0”, executes the next

instruction.

When V11 = 1 : This instruction is equivalent to the NOP

instruction.

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