DS80C390 datasheet(13/155 Pages) DALLAS

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DS80C390 High-Speed Microcontroller User’s Guide Supplement

13 of 155

Data Pointer High 1 (DPH1)

6543

210

SFR 85h

DPH1.7

DPH1.6

DPH1.5

DPH1.4

DPH1.3

DPH1.2

DPH1.1

DPH1.0

RW-0

R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset

DPH1.7-0

Bits 7-0

Data Pointer High 1. This register is the high byte of the auxiliary 16-bit data

pointer. When the SEL bit (DPS.0) is set, DPL1 and DPH1 are used in place of

DPL and DPH during DPTR operations.

Data Pointer Select (DPS)

6543

210

SFR 86h

ID1

ID0

TSL

SEL

RW-0

R-0

R-1

R-0

RW-0

R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset

ID1, ID0

Bits 7-6

Increment/Decrement Function Select. These bits define whether the INC

DTPR instruction will increment or decrement the active data pointer as selected

by the SEL bit.

ID1

ID0

SEL=0

SEL=1

Increment DPTR

Increment DPTR1

Decrement DPTR

Increment DPTR1

Increment DPTR

Decrement DPTR1

Decrement DPTR

Decrement DPTR1

TSL

Bit 5

Toggle Select Enable. When set, this bit allows the following five DPTR-

related instructions to toggle the SEL bit following execution of the

instruction. When TSL=0, DPTR-related instructions will not affect the state

of the SEL bit. DPTR-related instructions are:

INC

DPTR

MOV

DPTR, #data16

MOVC A, @A+DPTR

MOVX @DPTR, A

MOVX A, @DPTR

Bits 4-1

Reserved.

SEL

Bit 0

Data Pointer Select. This bit selects the active data pointer.

0 = Instructions that use the DPTR will use DPL, DPH, DPX.

1= Instructions that use the DPTR will use DPL1 and DPH1, DPX1.

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