4571 datasheet(76/126 Pages) RENESAS

76 / 126 page

Rev.1.02

May 25, 2007

Page 76 of 124

REJ03B0179-0102

4571 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

IAP2

(Input Accumulator from port P2)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

110

10 2 26 2 16

Opera-

tion:

(A1, A0)

← (P21, P20)

(A3, A2)

← 0

Grouping:

Input/Output operation

Description: Transfers the input of port P2 to the low-order 2 bits (A1,

A0) of register A.

“0” is stored to the high-order 2 bits (A3, A2) of register A.

IAP3

(Input Accumulator from port P3)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

110

11 2 26 3 16

Opera-

tion:

(A1, A0)

← (P31, P30)

(A3, A2)

← 0

Grouping:

Input/Output operation

Description: Transfers the input of port P3 to the low-order 2 bits (A1,

A0) of register A.

“0” is stored to the high-order 2 bits (A3, A2) of register A.

INY

(INcrement register Y)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

001

11 2 01 3 16

(Y) = 0

Opera-

tion:

(Y)

← (Y) + 1

Grouping:

RAM addresses

Description: Adds 1 to the contents of register Y. As a result of addition,

when the contents of register Y is 0, the next instruction is

skipped. When the contents of register Y is not 0, the next

instruction is executed.

LA n

(Load n in Accumulator)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

111

nn 2 07 n 16

Continuous

description

Opera-

tion:

(A)

← n

n = 0 to 15

Grouping:

Arithmetic operation

Description: Loads the value n in the immediate field to register A.

When the LA instructions are continuously coded and exe-

cuted, only the first LA instruction is executed and other LA

instructions coded continuously are skipped.

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