NSC800D datasheet(40/76 Pages) NSC

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126 8-Bit Arithmetic (Continued)

76543210

11101110

Timing

M cycles2

T states7 (4 3)

Addressing Mode

SourceImmediate

DestinationImplied

Compare the immediate data n with the contents of the Ac-

cumulator via subtraction and return the appropriate flags

The contents of the Accumulator are not affected

A b n

S Set if result is negative

Z Set if result is zero

H Set if borrow from bit 4

PV Set if result exceeds 8-bit 2’s

complement range

N Set

C Set according to borrow condi-

tion

76543210

11111110

Timing

M cycles2

T states7 (4 3)

Addressing Mode

Immediate

MEMORY ADDRESSED ARITHMETIC

ADD

A m1

Add the contents of the memory location m1 to the Accumu-

lator

w A a m1

S Set if result is negative

Z Set if result is zero

H Set if carry from bit 3

PV Set if result exceeds 8-bit 2’s

complement range

N Reset

C Set according to carry from bit

76543210

10000110

ADD A (HL)

Timing

M cycles2

T states7 (4 3)

Addressing Mode

SourceRegister Indirect

DestinationImplied

43210

ADD A (IX a d) (for NXe0)

11NX 11101

ADD A (IY a d) (for NXe1)

00110

Timing

M cycles5

T states19 (4 4 3 5 3)

Addressing Mode

SourceIndexed

DestinationImplied

ADC

A m1

Add the contents of the memory location m1 plus the carry

to the Accumulator

w A a m1 a CY S Set if result is negative

Z Set if result is zero

H Set if carry from bit 3

PV Set if result exceeds 8-bit 2’s

complement range

N Reset

C Set according to carry from bit

76543210

10001110

ADC A (HL)

Timing

M cycles2

T states7 (4 3)

Addressing Mode

SourceRegister Indirect

DestinationImplied

43210

ADC A (IX a d) (for NXe0)

11NX 11101

ADC A (IY a d) (for NXe1)

01110

Timing

M cycles5

T states19 (4 4 3 5 3)

Addressing Mode

SourceIndexed

DestinationImplied

SUB

Subtract the contents of memory location m1 from the Ac-

cumulator

w A b m1

S Set if result is negative

Z Set if result is zero

H Set if borrow from bit 4

PV Set if result exceeds 8-bit 2’s

complement range

N Set

C Set according to borrow condi-

tion

NSC800D Datasheet(PDF) 40 Page - National Semiconductor (TI)

NSC800D Datasheet(HTML) 40 Page - National Semiconductor (TI)

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