NEC PD75402A Manuale Utente

Function: A 

←

 n4; n4 = I

3

 to I

0

 : 0 to FH

Moves 4-bit immediate data n4 to the A register (4-bit accumulator).

This instruction has a stacking effect (group A). When placed after a MOV A, #n4 or MOV XA, #n8 instruction,

stack instructions following the executed instruction are processed as NOP.

Application examples:

➀

Set 0BH into accumulator.

MOV A, #0BH

➁

Select the data to be output at Port 3 from 0 to 2.

A0:

MOV A, #0

A1:

MOV A, #1

A2:

MOV A, #2

OUT PORT 3, A

Function: rp 

←

 n8; n8 = I

7

 to I

0

 : 00H to FFH

Moves 8-bit immediate data n8 to register pair rp (XA, HL).

This instruction has a stacking effect. There are two stacking effects: Group A (MOV A, #n4 instruction and

MOV XA, #n8 instruction), and group B (MOV HL, #n8 instruction). When instructions of the same group are

placed consecutively, the stack instructions after the executed instruction are processed as NOP.

Application example:

Set 5FH into register pair HL.

MOV HL, #5FH

Function: A 

←

 (HL)

Moves the data memory contents addressed by the contents of register pair HL to the A register.

Application example:

Move the data of address 3EH to the A register.

MOV HL, #3EH

MOV A, @HL