8051 instruction :: Movx

MOVX


Operation:MOVX
Function:Move Data To/From External Memory (XRAM)
Syntax:MOVX operand1,operand2

InstructionsOpCodeBytesCyclesFlags
MOVX @DPTR,A0xF012None
MOVX @R0,A0xF212None
MOVX @R1,A0xF312None
MOVX A,@DPTR0xE012None
MOVX A,@R00xE212None
MOVX A,@R10xE312None

Description: MOVX moves a byte to or from External Memory into or from the Accumulator.

If operand1 is @DPTR, the Accumulator is moved to the 16-bit External Memory address indicated by DPTR. This instruction uses both P0 (port 0) and P2 (port 2) to output the 16-bit address and data. If operand2 is DPTR then the byte is moved from External Memory into the Accumulator.

If operand1 is @R0 or @R1, the Accumulator is moved to the 8-bit External Memory address indicated by the specified Register. This instruction uses only P0 (port 0) to output the 8-bit address and data. P2 (port 2) is not affected. If operand2 is @R0 or @R1 then the byte is moved from External Memory into the Accumulator.









Post Your Comments Here :
 


User Login

Username :


Password :