4571 Datasheet, PDF(83/126 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4571 Datasheet, PDF (83/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4571 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

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

Instruc-

tion

code

0 0 0 0 1 0 0 1 0 1 2 0 2 5 16

Number of

words

Number of

cycles

Flag CY

Skip condition

(A) = n

n = 0 to 15

0 0 0 1 1 1 n n n n 2 0 7 n 16 Grouping: Comparison operation

Opera- (A) = n ?

tion: n = 0 to 15

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.

SEAM (Skip Equal, Accumulator with Memory)

Instruc-

tion

code

0 0 0 0 1 0 0 1 1 02 0 2

6 16

Number of

words

Number of

cycles

Flag CY

Skip condition

(A) = (M(DP))

Opera- (A) = (M(DP)) ?

tion:

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-

Number of

tion

code

0 0 0 0 1 1 1 0 0 0 2 0 3 8 16

words

Number of

cycles

Flag CY

Skip condition

V10 = 0 : (EXF0) = 1

Opera-

tion:

V10 = 0 : (EXF0) = 1 ?

(EXF0) â 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 â1â. When the EXF0 flag is â0â, 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-

Number of

tion

code

0 0 0 0 1 1 1 0 0 1 2 0 3 9 16

words

Number of

cycles

Flag CY

Skip condition

V11 = 0 : (EXF1) = 1

Opera-

tion:

V11 = 0 : (EXF1) = 1 ?

(EXF1) â 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 â1â. When the EXF1 flag is â0â, executes the next

instruction.

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

instruction.

Rev.1.02 May 25, 2007 Page 83 of 124

REJ03B0179-0102

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