AT89LP6440 datasheet(152/194 Pages) ATMEL

152 / 194 page

152

3706A–MICRO–9/09

AT89LP6440 - Preliminary

22.1.11

MOVX A, @/DPTR

Function: Move External using Alternate Data Pointer

Description: The MOVX instruction transfesr data from external data memory to the Accumulator. The unselected Data

Pointer generates a 16-bit address which targets EDATA, FDATA or XDATA.

Example: DPS = 0, DPTR0 contains 0123H and DPTR1 contains 4567H. The following instruction sequence,

MOVX

A, @DPTR

MOVX

@/DPTR, A

copies the data from address 0123H to 4567H.

Bytes: 2

Cycles: 3 (EDATA)

5 (FDATA or XDATA)

Encoding:

110

000

Operation: MOVX

IF (DPS) = 0

(A)

← ((DPTR1))

ELSE

(A)

← ((DPTR0))

22.1.12

MOVX @/DPTR, A

Function: Move External using Alternate Data Pointer

Description: The MOVX instruction transfesr data from the Accumulator to external data memory. The unselected Data

Pointer generates a 16-bit address which targets EDATA, FDATA or XDATA.

Example: DPS = 0, DPTR0 contains 0123H and DPTR1 contains 4567H. The following instruction sequence,

MOVX

A, @DPTR

MOVX

@/DPTR, A

copies the data from address 0123H to 4567H.

Bytes: 2

Cycles: 3 (EDATA)

5 (FDATA or XDATA)

Encoding:

111

000

Operation: MOVX

IF (DPS) = 0

THEN

((DPTR1))

← (A)

ELSE

((DPTR0))

← (A)

AT89LP6440 Datasheet(PDF) 152 Page - ATMEL Corporation

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