4571 datasheet(84/126 Pages) RENESAS

84 / 126 page

Rev.1.02

May 25, 2007

Page 84 of 124

REJ03B0179-0102

4571 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

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 : (INT0) = “L” ?

I12 = 1 : (INT0) = “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

INT0 pin is “L”. Executes the next instruction when the

level of INT0 pin is “H”.

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

INT0 pin is “H.” Executes the next instruction when the

level of INT0 pin is “L”.

SNZI1

(Skip if Non Zero condition of external Interrupt 1 input pin)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

011

11 2 03 B 16

I22 = 0 : (INT1) = “L”

I22 = 1 : (INT1) = “H”

Opera-

tion:

I22 = 0 : (INT1) = “L” ?

I22 = 1 : (INT1) = “H” ?

Grouping:

Interrupt operation

Description: When I22 = 0 : Skips the next instruction when the level of

INT1 pin is “L”. Executes the next instruction when the

level of INT1 pin is “H”.

When I22 = 1 : Skips the next instruction when the level of

INT1 pin is “H”. Executes the next instruction when the

level of INT1 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”.

SNZT1

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

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

000

00 2 28 0 16

V12 = 0 : (T1F) = 1

Opera-

tion:

V12 = 0 : (T1F) = 1 ?

(T1F)

← 0

V12 = 1 : SNZT1 = NOP

(V12 = bit 2 of interrupt control register V1)

Grouping:

Timer operation

Description: When V12 = 0 : Clears (0) to the T1F flag and skips the

next instruction when timer 1 interrupt request flag T1F is

“1”. When the T1F flag is “0,” executes the next instruction.

When V12 = 1 : This instruction is equivalent to the NOP

instruction.

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