PD780 datasheet(22/24 Pages) NEC

22 / 24 page

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Instruction Set (cont)

1::

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Operation Code

No. of

Flags

Mnemonic

Operation

OescrlpUon

7 6 5 .32 1 0

Clocks

Bytes

P/V

...

RRC (HL)

Rotate lac. (HL) right circular

1 1 a a

0 0

000 0

RRC (IX + d) �

Rotate lac (IX + d) right circular

1 1 0 1 1 1 01

0 0

1 1 o 0 1 o 1 1

d d d d d d d d

0 0 0

1 1 1

RRC (IY + d)

m : r, (HL),

Rotate lac. (IY + d) right circular

1 1 11 1 1 o1

0 0

(IX + d), (IY + d), A

1 1 o 0 1 011

d d d d d d d d

0 0 0

1 1 1 0

RRCA

Rotate right circular ACC

000 0

• • •

0 0

Rotate digit right and then left between

•

0 0

ACC and location (HL)

RRD

RST,

(SP - 1) - PCH

Restart to location T

1 1 t t t 1 1 1

• • • • • •

(SP - 2) - PCl

PCH - 0, PCl - T

SBC A, r

A - A - r CY

Subtract Reg. r from ACC w/carry

r r r (8)

SBC A, n

A - A - n - CY

Subtract value n from ACC with carry

n n n n n n n n

SBC A, (HL)

A - A - (HL) - CY

Sub. loc. (HL) from ACC w/carry

SBC A, (IX + d) A - A - (IX + d) - CY

Subtract lac. (IX + d) from ACC with carry 1 1 0 1 1 1 01

1 o 0 1 1 1 1 0

d d d d d d d d

SBC A, (IY + d) A - A - (IY + d) - CY

Subtract lac. (lY + d) from ACC with carry

1 1 1 1 1 1 01

1 o 0 1 1 1 1 0

d d d d d d d d

SBC HL, 55

HL-HL

- 55

- CY

Subtract Reg. pair 55 from HL with carry

1 0 1 (AI

0 5 5

1 0

SCF

CY - 1

Set carry flag (C :1)

o11

• • •

0 0

SET b, (HL)

(HL)b

- 1

Set Bit b of location (HL)

1 o 0 1 0 1 1 (E)

• • • • • •

b b b 1 1 0

SET b, (IX + d)

(IX + d)b - 1

Set Bit b of location (IX + d)

1 1 0 1 1 1 0 1 (El

• • • • • •

�

1 1 o 0 1 o 1 1

d d d d d d d d

1 1

b b b1 1 0

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