1989_MELPS_7700_Software_Manual

LOA Load Accumulator from Memory LOA
Operation
Acc ~ M
Description
Loads the contents of memory into the accumulator.
Status flags
IPL :
N
V
m
x
D
Not affected.
Set to 1 when bit 15 (or bit 7 if the data length selection flag m is set to 1) of
the operation result is 1. Otherwise, cleared to O.
Not affected.
Not affected.
Not affected.
Not affected.
Not affected.
Z Set to 1 when the result of operation is O. Otherwise, cleared to O.
C
Not affected.
Addressing mode Syntax Machine code Bytes Cycles
Immediate LOA A, #imm A916, imm 2 2
Direct LOA A, dd A516, dd 2 4
Direct indexed X LDA A, dd, X B516, dd 2 5
Direct indirect LDA A, (dd) B216, dd 2 6
Direct indexed X indirect LDA A, (dd, X) A116, dd 2 7
Direct indirect indexed Y LDA A, (dd), Y B116, dd 2 8
Direct indirect long LDAL A, (dd) A716, dd 2 10
Direct indirect long indexed Y LDAL A, (dd), Y B716, dd 2 11
Absolute LOA A, mmll AOI6, II, mm 3 4
Absolute indexed X LOA A, mmll, X BDI6, II, mm 3 6
Absolute indexed Y LDA A, mmll, Y B916, II, mm 3 6
Absolute long LDA A, hhmmll AFI6, II, mm, hh 4 6
Absolute long indexed X LDA A, hhmmll, X BFI6, II, mm, hh 4 7
Stack pointer relative LDA A, nn, S A316, nn 2 5
Stack pointer relative LOA A, (nn, S), Y B316, nn 2 8
indirect indexed Y
(Notel) This table applies when using the accumulator A. If using the accumulator B, replace "A" with "B".
In this case, "4216" is added at the beginning of the machine code, the bytes-count Increases by
1 and the cycles-count increases by 2.
(Note2) When operating on 16-bit data in the immediate addressing mode with the data length selection flag
rn set to 0, the bytes-count increases by 1.
94