DS80C390_00 Datasheet, PDF (13/155 Pages) Dallas Semiconductor – High-Speed Microcontroller User’s Guide Supplement

DS80C390 High-Speed Microcontroller User’s Guide Supplement
Data Pointer High 1 (DPH1)
7
6
5
4
3
2
1
0
SFR 85h DPH1.7 DPH1.6 DPH1.5 DPH1.4 DPH1.3 DPH1.2 DPH1.1 DPH1.0
RW-0 RW-0 RW-0 RW-0 RW-0 RW-0 RW-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)
7
6
5
4
3
2
1
SFR 86h ID1
ID0
TSL
0
0
1
0
RW-0 RW-0 RW-0
R-0
R-0
R-1
R-0
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
0
SEL
RW-0
ID1, ID0
Bits 7-6
TSL
Bit 5
Bits 4-1
SEL
Bit 0
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
0
0 Increment DPTR Increment DPTR1
0
1 Decrement DPTR Increment DPTR1
1
0 Increment DPTR Decrement DPTR1
1
1 Decrement DPTR Decrement DPTR1
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
Reserved.
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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