PD780 datasheet(18/24 Pages) NEC

18 / 24 page

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Instruction Set (cont)

1;::

I\J

Operation Code

No. of

Flags

Mnemonic

Operation

Description

7 & 5 • 3 2 1 0

Clocles

Bytes

PlY

....

LD (nn). HL

(nn +1) - H

Load location (nn) with HL

o 0 000 0

• • • • • •

(nn) +- L

n n n n n n n n

LD (nn). IX

(nn +1) - IXH

Load location (nn) with IX

1 1 0

111 0

• • • • • •

(nn) - IXL

a a1 a a a 1 0

n n n n n n n n

LD(nn). IY

(nn +1) - IYH

Load location (nn) with IY

111 a1

• • • • • •

(nn) +- IYL

000

1 0

n n n n n n n n

LD R, A

R - A

Load R with ACC

1 0

• • • • • •

LD r, (HL)

- (HL)

Load Reg. r with location (HL)

(8)

• • • • • •

LD r, (IX

+ d)

r - (IX

+ d)

Load Reg. r with location (IX + d)

1 1 0

1 0

(8)

• • • • • •

r r r

11 0

d d d d d d d d

LD r, (IY +d)

r - (IY +d)

Load Reg. r with location (IY + d)

1 1

1 0

(8)

• • • • • •

r r r 1 1 0

d d d d d d d d

LD r, n

r -n

Load Reg. r with value n

0a r

r r1

(8)

• • • • • •

n n n n n n n n

LD, r, r'

r- r'

Load Reg. r with Reg. r'

r r r' r' r'

(F)

• • • • • •

LD SP , HL

SP - HL

Load SP with HL

o 0

• • • • • •

LD SP , IX

Load SP with IX

1 0

• • • • • •

LD SP , IY

SP -IY

Load SP with IY

1 0

• • • • • •

o 0

LDD

(DE) - (HL)

Load location (DE) with location (HL),

0 1 0

• • •

0 0

DE +-

DE -1

decrement DE, HL and BC

a a 0

HL +- HL -1, BC +- BC -1

LDDR

(DE) -

(HL)

Load location (DE) with location (H L)

0 1 0 1

• •

0 •

0 a

DE - DE -1

0 1

o 00

HL - HL -1, BC +- BC -1 until

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