NSC800 datasheet(50/76 Pages) NSC

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1210 Exchanges (Continued)

EXX

Exchange the contents of the BC DE and HL registers with

their corresponding alternate register

B’C’

No flags affected

D’E’

H’L’

76543210

11011001

Timing

M cycles

T states

Addressing Mode

Implied

REGISTERMEMORY

(SP) ss

Exchange the two bytes at the top of the external memory

stack with the 16-bit register ss

(SP)

SSL

No flags affected

(SP a 1)

SSH

76543210

EX (SP) HL

Timing

M cycles

T states

19 (4 3 4 3 5)

Addressing Mode

RegisterRegister Indirect

3210

EX (SP) IX (for NX e 0)

11NX 11101

EX (SP)IY (for NX e 1)

0011

Timing

M cycles

T states

23 (4 4 3 4 3 5)

Addressing Mode

RegisterRegister Indirect

1211 Memory Block Moves and

Searches

SINGLE OPERATIONS

LDI

Move data from memory location (HL) to memory location

(DE)

increment memory pointers

and decrement byte

counter BC

(DE)

w (HL)

S NA

w DE a 1

Z NA

w HL a 1

H Reset

w BC b 1

PV Set if BC b1 i 0 other-

wise reset

N Reset

C NA

76543210

11101101

10100000

Timing

M cycles

T states

16 (4 4 3 5)

Addressing Mode

LDD

Move data from memory location (HL) to memory location

(DE) and decrement memory pointer and byte counter BC

(DE)

w (HL)

S NA

w DE b 1

Z NA

w HL b 1

H Reset

w BC b 1

PV Set if BC b1 i 0 other-

wise reset

N Reset

C NA

76543210

11101101

10101000

Timing

M cycles

T states

16 (4 4 3 5)

Addressing Mode

CPI

Compare data in memory location (HL) to the Accumulator

increment the memory pointer and decrement the byte

counter The Z flag is set if the comparison is equal

A b (HL)

S Set if result of comparison sub-

tract is negative

w HL a 1

w BC b 1

Z Set if result of comparison is

w 1

zero

if A e (HL)

H Set according to borrow from

bit 4

PV Set if BC b 1 i 0 otherwise

reset

N Set

C NA

76543210

11101101

10100001

Timing

M cycles

T states

16 (4 4 3 5)

Addressing Mode

CPD

Compare data in memory location (HL) to the Accumulator

and decrement the memory pointer and byte counter The Z

flag is set if the comparison is equal

A b (HL)

S Set if result is negative

w HL b 1

Z Set if result of comparison is

zero

w BC b 1

H Set according to borrow from

w 1

bit 4

if A e (HL)

PV Set if BC b 1 i 0 otherwise

reset

N Set

C NA

NSC800 Datasheet(PDF) 50 Page - National Semiconductor (TI)

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