SEC1210 datasheet(30/218 Pages) MICROCHIP

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SEC1110/SEC1210

DS00001561C-page 30

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9.1.6

DATA POINTER SELECT REGISTER – DPS

The R8051XC2 contains up to two data pointer registers. Each of these registers can be used as 16-bit address source

for indirect addressing. The DPS Register serves for selecting the active data pointer register.

9.1.7

DATA POINTER CONTROL REGISTER – DPC

The R8051XC2 contains an optional DPTR-related arithmetic unit. It provides auto-increment/auto-decrement by 1 or

2, and auto-switching between active DPTRs. These functions are controlled by the DPC Register, where there are sep-

arate DPC register bits for each DPTR, to provide high flexibility in data transfers. The DPC Register address 0x93

points to the window where the actual dpc is selected using the DPS Register, same as for the DPTR.

TABLE 9-9:

DATA POINTER SELECT REGISTER

DPS

(SFR 0X92 - RESET=0X00)

DATA POINTER SELECT REGISTER

BIT

NAME

R/W

DESCRIPTION

7:1

Reserved

Always read as 0

dpsel0

R/W

Data Pointer Register Select:

: Data pointer 0 selected

: Data pointer 1 selected

TABLE 9-10:

DATA POINTER CONTROL REGISTER

DPC

(SFR 0X93 - RESET=0X00)

DATA POINTER CONTROL REGISTER

BIT

NAME

R/W

DESCRIPTION

7:6

Reserved

Always read as 0

5:4

dpc[5:4]

R/W

Not used

dpc.3

R/W

Next Data Pointer Selection:

The contents of this field is loaded to the DPS Register bit 0 after

each MOVX @DPTR instruction.

Note:

This feature is not always enabled. Therefore, for each of

the DPS registers this field has to contain a different value

pointing to itself so that the auto-switching does not occur

with default (reset) values.

dpc.2

R/W

Auto-Modification Size:

When 0, the current DPTR is automatically modified by 1 after each

MOVX @DPTR instruction when dps.0=1. When 1, the current DPTR

is automatically modified by 2 after each MOVX @DPTR instruction

when dps.0=1.

dps.1

R/W

Auto-Modification Direction:

When 0, the current DPTR is automatically incremented after each

MOVX @DPTR instruction when dps.0=1. When 1, the current DPTR

is automatically decremented after each MOVX @DPTR instruction

when dps.0=1.

dps.0

R/W

Auto-Modification Enable:

When set, enables auto-modification of the current DPTR after each

MOVX @DPTR instruction

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