AT89LP428 datasheet(19/149 Pages) ATMEL

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3654A–MICRO–8/09

AT89LP428/828

Table 5-3.

DPTR Auto-update

DPD1

DPD0

Operation for MOVX and MOVC (DPU1 = 1 & DPU0 = 1)

DPS = 0

DPS = 1

DPTR

/DPTR

DPTR

/DPTR

DPTR0++

DPTR1++

DPTR0++

DPTR0--

DPTR1++

DPTR0--

DPTR0++

DPTR1--

DPTR0++

DPTR0--

DPTR1--

DPTR0--

Table 5-4.

DPCF

– Data Pointer Configuration Register

DPCF = A2H

Reset Value = 0000 00X0B

Not Bit Addressable

DPU1

DPU0

DPD1

DPD0

SIGEN

–

DPS

Bit

765

4321

Symbol

Function

DPU1

Data Pointer 1 Update. When set, MOVX @DPTR and MOVC @DPTR instructions that use

DPTR1 will also update DPTR1 based on DPD1. If DPD1 = 0, the operation is post-

increment and if DPD1 = 1 the operation is post-decrement. When DPU1 = 0, DPTR1 is

not updated.

DPU0

Data Pointer 0 Update. When set, MOVX @DPTR and MOVC @DPTR instructions that use

DPTR0 will also update DPTR0 based on DPD0. If DPD0 = 0, the operation is post-

increment and if DPD0 = 1, the operation is post-decrement. When DPU0 = 0, DPTR0 is

not updated.

DPD1

Data Pointer 1 Decrement. When set, INC DPTR instructions targeted to DPTR1 will

decrement DPTR1. When cleared, INC DPTR instructions will increment DPTR1.

DPD0

Data Pointer 0 Decrement. When set, INC DPTR instructions targeted to DPTR0 will

decrement DPTR0. When cleared, INC DPTR instructions will increment DPTR0.

SIGEN

Signature Enable. When SIGEN = 1, all MOVC @DPTR instructions and all IAP accesses

will target the signature array memory. When SIGEN = 0, all MOVC and IAP accesses target

CODE memory.

DPS

Data Pointer Select. DPS selects the active data pointer for instructions that reference

DPTR. When DPS = 0, DPTR will target DPTR0 and /DPTR will target DPTR1. When

DPS = 1, DPTR will target DPTR1 and /DPTR will target DPTR0.

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