PD780 datasheet(19/24 Pages) NEC

19 / 24 page

Instruction Set (cont)

�

Opel8llon Coda

No. of

No.

Flags

Mnemanle

OpBl'llllon

DBlCriptlon

7 6 5 .3 2 1 0

Clocks

Byles

PlY

LD I

(DE)

(HL)

Load location (DE )wilh location

1 0 1

• •

;(T) •

DE <-DE + 1

(HL), increment DE , HL; decrement

o 0 0 0 0

HL <-

HL +1

BC <- BC - 1

LDIR

(DE )

(HL)

Load location (DE )with location (HL);

0 1

1 0 1

if BC ,. 0

• •

•

DE <- DE

+ 1

increment DE, HL,

1 o 0 0 0

if BC = 0

HL + 1

decrement BC and repeat until BC

BC <- BC -1

until BC

NEG

A -

O -A

Negate ACC (2's complement)

1 a 1

0 1

000

o 0

NOP

No operation

00000000

• • • • • •

OR r

A <-AV

Logical 'OR' of Reg. rand ACC

r r r (8)

OR n

A <- AV

Logical 'OR' of value n and ACC

•

n n n n n n n n

OR (Hl)

(HL)

Logical 'OR' of loc. (HL) and ACC

•

OR (IX + d)

- (IX + d)

Logical 'OR' of loc. (IX + d) /I ACC

1 1 a 1 1 1 a

•

1 a 1 1 0 1

1 0

ddddd dd d

OR (IY +d)

A <-AV

(IV

+ d)

Logical 'OR' of loc. (IY + d) /I ACC

1 a

•

1 0 1 1 0 1 1 a

d d d d d d d d

OTDR

(C )-

(H L)

Load output port (C )with contents of location

1 a

if B,. 0

•

X X

B<-B- l

(HL), decrement HL and B, repeat until B

o 1

if B

HL - HL -1 until B= 0

OTIR

(e)

(HL)

Load output port (C )with location (HL),

if B,. 0

•

X X

B-B- l

increment HL, decrement B.

if B = C

HI - HL + 1 until B

repeat until B = 0

OUT (C ), r

(C )<-

Load output port (C )with Reg. r

1 0 1

(8)

• • • • • •

r r r o 0 1

OUT (n), A

(n) <-A

Load output port (n) with AC e

o 0

• • • • • •

n n n n n n n n

OUTD

(e)

(HL)

Load output port (C )with location (HL),

1 0

•

1(3)

X X

B-B - l,

HL<-

HL-l

increment HL and decrement B

0 1

OUTI

(e) -(HL)

Load output port (e) with location (HL),

0 11 0

•

1(3)

X X

B -B-1,

HL -HL+1

increment HLand decrement B

000 1

1::

.....

.j>.

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