4501 datasheet(84/212 Pages) RENESAS

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Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

INSTRUCTIONS

1-72

Rev.2.01

Feb 07, 2005

4501 Group

HARDWARE

REJ09B0192-0201

RD (Reset port D specified by register Y)

0000010100

014

–

Grouping:

Input/Output operation

Description: Clears (0) to a bit of port D specified by register

Note:

Set 0 to 3 to register Y because port D is

four ports (D0–D3).

When values except above are set to regis-

ter Y, this instruction is equivalent to the

NOP instruction.

Operation:

(D(Y))

← 0

However,

(Y) = 0 to 3

RT (ReTurn from subroutine)

0001000100

044

–

Grouping:

Return operation

Description: Returns from subroutine to the routine called

the subroutine.

Operation:

(PC)

← (SK(SP))

(SP)

← (SP) – 1

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

RTI (ReTurn from Interrupt)

0001000110

046

–

Grouping:

Return operation

Description: Returns from interrupt service routine to

main routine.

Returns each value of data pointer (X, Y, Z),

carry flag, skip status, NOP mode status by

the continuous description of the LA/LXY in-

struction, register A and register B to the

states just before interrupt.

RTS (ReTurn from subroutine and Skip)

0001000101

045

–

Skip at uncondition

Grouping:

Return operation

Description: Returns from subroutine to the routine called

the subroutine, and skips the next instruction

at uncondition.

Operation:

(PC)

← (SK(SP))

(SP)

← (SP) – 1

Operation:

(PC)

← (SK(SP))

(SP)

← (SP) – 1

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