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MSM80C154S/83C154S/85C154HVS
334
75. MOVX A, @Rr (Move external memory addressed by register to accumulator)
1110001r
70
Instruction code
Operation
Number of bytes
Number of cycles
Flags
(PSW)
Description
Example MOVX A, @R1
Instruction code
: Byte 1
(A)←((Rr)) r=0 or 1:
C AC F0 RS1 RS0 OV F1 P
•
:
:
:
External data memory (RAM) contents addressed by the
register r contents are stored in the accumulator, and the flag is
updated.
:
1
2
11100011
70
Byte 1
Before execution After execution
:
01111010
70
00101000
70
Register 1
10111110
70
Register 1
10111110
70
0BEH
00101000
70
0BEH
00101000
70
Accumulator Accumulator