4571 Datasheet, PDF(86/126 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4571 Datasheet, PDF (86/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4571 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

SUPT (Set UPT flag)

Instruc-

tion

code

0 0 0 1 0 1 1 0 0 1 2 0 5 9 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (UPTF) â1

tion:

Grouping: Other operation

Description: Sets (1) to the high-order bit reference enable flag UPTF.

Note:

When the table reference instruction (TABP p) is executed,

the high-order 2 bits of ROM reference data is transferred

to the low-order 2 bits of register D.

SZB j (Skip if Zero, Bit)

Instruc-

tion

code

0 0 0 0 1 0 0 0 j j 2 0 2 j 16

Number of

words

Number of

cycles

Flag CY

Skip condition

(Mj(DP)) = 0

j = 0 to 3

Opera- (Mj(DP)) = 0 ?

tion: j = 0 to 3

Grouping: Bit operation

Description: Skips the next instruction when the contents of bit j (bit

specified by the value j in the immediate field) of M(DP) is

â0â.

Executes the next instruction when the contents of bit j of

M(DP) is â1â.

SZC (Skip if Zero, Carry flag)

Instruc-

tion

code

0 0 0 0 1 0 1 1 1 1 2 0 2 F 16

Number of

words

Number of

cycles

Flag CY

Skip condition

(CY) = 0

Opera- (CY) = 0 ?

tion:

Grouping: Arithmetic operation

Description: Skips the next instruction when the contents of carry flag

CY is â0â.

After skipping, the CY flag remains unchanged.

Executes the next instruction when the contents of the CY

flag is â1â.

SZD (Skip if Zero, port D specified by register Y)

Instruc-

tion

code

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

Number of

words

Number of

cycles

Flag CY

Skip condition

(D(Y)) = 0

0 0 0 0 1 0 1 0 1 1 2 0 2 B 16 Grouping: Input/Output operation

Opera- (D(Y)) = 0 ?

tion: (Y) = 0 to 4

Description: Skips the next instruction when a bit of port D specified by

is â1â.

Note:

(Y) = 0 to 4.

Do not execute this instruction if values except above are

set to register Y.

Rev.1.02 May 25, 2007 Page 86 of 124

REJ03B0179-0102

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