8051 Data Pointer

DPTR

• Address: 0x83 – 0x82.
• Size: 16-bit.
• Byte and word addressable.
• Used to point to data.
• Used to access external data or code memory.
• 8051 will access external memory at the address indicated by DPTR.
• DPTR holds the memory addresses for internal and external code access and external data access (eg. MOVC A,@A+DPTR MOVX A,@DPTR MOVX @DPTR,A )
• Often used to point to data in external memory.
• It’s the only user accessible 16-bit register.
• Can be used as temporary storage.
• Can also be used as two 8-bit registers. DPH – 0x83, DPL – 0x82.
• MOV DPTR, #2550H
  is same as
  MOV DPL, #50H
  MOV DPH, #25H

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Related topics:
8051 Registers   |   8051 Program Counter   |   8051 R Registers   |   8051 SFR   |   8051 P Registers   |   8051 Stack   |   8051 Stack Pointer   |   8051 PCON Register   |   8051 TCON Register   |   8051 TMOD Register   |   8051 Timer Registers   |   8051 SCON Register   |   8051 SBUF Register   |   8051 IE Register   |   8051 IP Register   |   8051 PSW Register   |   8051 A Register   |   8051 B Register

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List of topics: 8051

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