455A Datasheet, PDF(92/148 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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455A Datasheet, PDF (92/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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455A Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

EI (Enable Interrupt)

Instruc-

tion

code

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

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (INTE) â 1

tion:

Grouping: Interrupt control operation

Description: Sets (1) to interrupt enable flag INTE, and enables the

interrupt.

Note:

Interrupt is enabled by executing the EI instruction after

executing 1 machine cycle.

EPOF (Enable POF instruction)

Instruc-

tion

code

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

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- POF instruction or POF2 instruction valid

tion:

Grouping: Other operation

Description: Makes the immediate after POF instruction or POF2

instruction valid by executing the EPOF instruction.

IAP0 (Input Accumulator from port P0)

Instruc-

tion

code

1 0 0 1 1 0 0 0 0 0 2 2 6 0 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (A) â (P0)

tion:

Grouping: Input/Output operation

Description: Transfers the input of port P0 to register A.

IAP1 (Input Accumulator from port P1)

Instruc-

tion

code

1 0 0 1 1 0 0 0 0 1 2 2 6 1 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (A) â (P1)

tion:

Grouping: Input/Output operation

Description: Transfers the input of port P1 to register A.

Rev.1.01 Feb 15, 2008 Page 92 of 146

REJ03B0224-0101

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