PD780 datasheet(14/24 Pages) NEC

14 / 24 page

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Instruction Set (cont)

1:::

�

OperaUon Code

No.

01 No. 01

Flags

Mnemonic

Operation

Description

7 6 5 4 3 2 1 0

Clocks

Bytes

PlY

�

BIT b. (HL

)

Z - (HL) b

Test BIT b of location (HL

)

00 1

(E)

•

b b b 1

BIT b. (IX + d)

Z - (IX + d) b

Test BIT b at location (IX + d)

0 1

(E)

•

1 0 1

d d d d d d d d

0 1

b b b 1 1 0

BIT b. (IV + d)

Z - (IV + di b

Test BIT b at location (IV

+ d)

0 1

(E)

•

00 1

0 1

d d d d d d d d

0 1

b b b 1 1 0

BIT b, r

Z <- rb

Test BIT of Reg, r

o 0 1 0 1 1

•

X 0

b b b r

r r

(8) (E)

CALL cc, nn

If condition cc false continues,

Call subroutine at location nn if

..... cc -+-

0 o

(H)

• • • • • •

else same as CALL nn

condition cc is true

n n n n n n n n

CALL nn

(SP - 1) - PCH

Unconditional call subroutine at

• • • • • •

(SP - 2) - PCl

location nn

n n n n n n n n

PC - nn

n n n n n n n n

CCF

CV - CV

Complement carry flag

o 0

• • •

CP r

A - r

Compare Reg, r with ACC

(8)

CP n

A - n

Compare value n with ACC

n n n n n

n n n

CP (HL

)

A - (HL

)

Compare loc, (HL

) with ACC

CP (IX + d)

A - (IX + d)

Compare loc, (IX + d) with ACC

0 1

d d d d d d d d

0 1

CP (IV + d)

Compare loc, (IV + d) with ACC

0 1

d d d d d d d d

CPO

A - (HL)

Compare location (HL

) and ACC,

0 1

•

1(2) 1(1)

- HL- 1

decrement HLand BC

00 1

BC - BC - 1

CPDR

A - (HL

)

Compare location (HL

) and ACC,

if BC = 0 2

•

1(2) 1(1) I

HL- 1

decrement H Land BC, repeat until BC = 0

and M( HL

)

�

BC <- BC - 1

if BC=0

until A = (HL

) or BC = 0

or A=(HL)

CPI

A - (HL

)

Compare location (HL

) and ACC,

0 1

•

1(2) 1(1) 1

+ 1, BC - BC - 1

increment HLand decreme nt BC

0000

�

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