4559 datasheet(97/148 Pages) RENESAS

97 / 148 page

Rev.1.04

Aug 23, 2007

Page 97 of 146

REJ03B0188-0104

4559 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

RTI

(ReTurn from Interrupt)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

100

10 2 04 6 16

Opera-

tion:

(PC)

← (SK(SP))

(SP)

← (SP) − 1

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 instruction, register A and register B to the

states just before interrupt.

RTS

(ReTurn from subroutine and Skip)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

100

01 2 04 5 16

Skip at uncondition

Opera-

tion:

(PC)

← (SK(SP))

(SP)

← (SP) − 1

Grouping:

Return operation

Description: Returns from subroutine to the routine called the subrou-

tine, and skips the next instruction at uncondition.

RUPT

(Reset UPT flag)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

101

00 2 05 8 16

Opera-

tion:

(UPTF)

←0

Grouping:

Other operation

Description: Clears (0) to the high-order bit reference enable flag UPTF.

Note:

Even when the table reference instruction (TABP p) is exe-

cuted, the high-order 2 bits of ROM reference data is not

transferred to register D.

SB j

(Set Bit)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

101

+j 16

Opera-

tion:

(Mj(DP))

← 1

j = 0 to 3

Grouping:

Bit operation

Description: Sets (1) the contents of bit j (bit specified by the value j in

the immediate field) of M(DP).

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