Intel 8080 - B2_Page_27

LDAX
Chapter 3. I nstruction Set
Opcode
Operand
LOA
address
The addre55 may be stated as a number, a previously defined label, or an expre55ion. The assembler inverts the
high and low
addre55 bytes when it builds the instruction.
0 0
1
Cycles:
States:
Addressing:
Flags:
Examples:
1
1
0
lowaddr
high addr
4
13
direct
none
1
0
The following instructions are equivalent. When executed, each replaces the accumulator contents with the byte
of data stored at memory location
300H.
LOAD:
LOA
LOA
LOA
300H
3*( 16*16)
200H+256
LOAD ACCUMULATOR INDIRECT
L OAX loads the accumulator with a copy of the byte stored at the memory location addressed by register pair
B or
register pair O.
Opcode Operand
LOAX
The operand B specifies the Band C register pair; 0 specifie<, the 0 and E register pair. This instruction may
specify only the B or 0 register pair.
loooirl 0 1~
Cycles:
States:
Addressing:
Flags:
~
II.....- ___ fo := register pair B
l1 := register pair 0
2
7
register indirect
none
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