NEC PD75P402 Instrukcja Użytkownika Pobierz pdf (Strona 172)

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CHAPTER 9. INSTRUCTION SET

XCH A, @HL

Function: A ← (HL)

Exchanges the contents of the A register and the contents of the data memory addressed by the contents

of register pair HL.

Application example: Exchange the data of data memory addresses 20H to 2FH and the data of addresses 30H

to 3FH.

MOV HL, #30H

LOOP: XCH A, @HL ; A ↔ (3×)

MOV H, #2

XCH A, @HL ; A ↔ (2×)

MOV H, #3

XCH A, @HL ; A ↔ (3×)

INCS L ; L ← L + 1

BR LOOP

XCH A, mem

Function: A ↔ (mem); mem = D7 to D0 ; 00H to 3FH

Exchanges the contents of the A register and the data memory contents addressed by 8-bit immediate data

mem.

XCH XA, mem

Function: A ↔ (mem), X ↔ (mem + 1); mem = D7 to D0 : 00H to 3EH

Exchanges the contents of the A register and the data memory contents addressed by 8-bit immediate data

mem and exchanges the contents of the X register and the contents of the next memory address.

mem can specify even addresses.

XCH A, reg1

Function: A ↔ reg1

Exchanges the contents of the A register and the contents of register reg1 (X, H, L).

1 2 ... 167 168 169 170 171 172 173 174 175 176 177 ... 194 195

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NEC PD75P402 Instrukcja Użytkownika Strona 172