455A Datasheet, PDF(98/148 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

455A Datasheet, PDF (98/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

◁

455A Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

RT (ReTurn from subroutine)

Instruc-

tion

code

0 0 0 1 0 0 0 1 0 0 2 0 4 4 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (PC) â (SK(SP))

tion: (SP) â (SP) â1

Grouping: Return operation

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

tine.

RTI (ReTurn from Interrupt)

Instruc-

tion

code

0 0 0 1 0 0 0 1 1 0 2 0 4 6 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (PC) â (SK(SP))

tion: (SP) â (SP) â 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

0 0 0 1 0 0 0 1 0 1 2 0 4 5 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Skip at uncondition

Operation:

(PC) â (SK(SP))

(SP) â (SP) â 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

0 0 0 1 0 1 1 0 0 0 2 0 5 8 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (UPTF) â0

tion:

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

00010111

+j 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (Mj(DP)) â 1

tion: 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).

Rev.1.01 Feb 15, 2008 Page 98 of 146

REJ03B0224-0101

▷