NSC800 Datasheet, PDF(37/76 Page) National Semiconductor (TI) – NSC800TM High-Performance Low-Power CMOS Microprocessor

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NSC800 Datasheet, PDF (37/76 Pages) National Semiconductor (TI) – NSC800TM High-Performance Low-Power CMOS Microprocessor

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12 6 8-Bit Arithmetic (Continued)

76543210

10100

Timing

Addressing Mode

M cycles 1

T states 4

Source Register

Destination Implied

OR r

Logically OR the contents of the r register and the Accumu-

lator

AwA r

S Set if result is negative

Z Set if result is zero

H Reset

P V Set if result parity is even

N Reset

C Reset

76543210

10110

Timing

Addressing Mode

M cycles 1

T states 4

Source Register

Destination Implied

XOR r

Logically exclusively OR the contents of the r register with

the Accumulator

w A

AZr

S Set if result is negative

Z Set if result is zero

H Reset

P V Set if result parity is even

N Reset

C Reset

76543210

10101

Timing

Addressing Mode

M cycles 1

T states 4

Source Register

Destination Implied

INC r

Increment register r

rwra1

S Set if result is negative

Z Set if result is zero

H Set if carry from bit 3

P V Set only if r was Xâ7F before

operation

N Reset

CNA

76543210

100

Timing

Addressing Mode

M cycles 1

T states 4

Source Register

Destination Register

CP r

Compare the contents of register r with the Accumulator

and set the flags accordingly

Abr

S Set if result is negative

Z Set if result is zero

H Set if borrow from bit 4

P V Set if result exceeds 8-bit 2âs

complement range

N Set

C Set according to borrow

76543210

10111

Timing

Addressing Mode

M cycles 1

T states 4

Source Register

Destination Implied

DEC r

Decrement the contents of register r

rwrb1

S Set if result is negative

Z Set if result is zero

H Set according to a borrow from

bit 4

P V Set only if r was Xâ80 prior to

operation

N Set

CNA

76543210

101

Timing

Addressing Mode

M cycles 1

T states 4

Source Register

Destination Register

CPL

Complement the Accumulator (1âs complement)

AwA

SNA

ZNA

H Set

PVNA

N Set

CNA

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