NEC PD75402A - Manual (Page 172)

161
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 = D 7 to D 0 ; 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 = D
7
to D
0
: 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).