4559 datasheet(99/148 Pages) RENESAS

99 / 148 page

Rev.1.04

Aug 23, 2007

Page 99 of 146

REJ03B0188-0104

4559 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

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.

SNZI0

(Skip if Non Zero condition of external Interrupt 0 input pin)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

011

10 2 03 A 16

I12 = 0 : (INT0) = “L”

I12 = 1 : (INT0) = “H”

Opera-

tion:

I12 = 0 : (INT) = “L” ?

I12 = 1 : (INT) = “H” ?

(I12 : bit 2 of the interrupt control register I1)

Grouping:

Interrupt operation

Description: When I12 = 0 : Skips the next instruction when the level of

INT pin is “L”. Executes the next instruction when the level

of INT pin is “H”.

When I12 = 1 : Skips the next instruction when the level of

INT pin is “H.” Executes the next instruction when the level

of INT pin is “L”.

SNZP

(Skip if Non Zero condition of Power down flag)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

000

11 2 00 3 16

(P) = 1

Opera-

tion:

(P) = 1 ?

Grouping:

Other operation

Description: Skips the next instruction when the P flag is “1”.

After skipping, the P flag remains unchanged.

Executes the next instruction when the P flag is “0”.

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