SST89V58RD Silicon Storage Technology, SST89V58RD Datasheet - Page 16

• Manufacturer Part Number: SST89V58RD
• Description: FlashFlex51 MCU
• Manufacturer: Silicon Storage Technology

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Data Sheet
3.5 Dual Data Pointers
The device has two 16-bit data pointers. The DPTR Select (DPS) bit in AUXR1 determines which of the two data
pointers is accessed. When DPS=0, DPTR0 is selected; when DPS=1, DPTR1 is selected. Quickly switching
between the two data pointers can be accomplished by a single INC instruction on AUXR1. (See Figure 3-5)
3.6 Special Function Registers
Most of the unique features of the FlashFlex51 microcontroller family are controlled by bits in special function regis-
ters (SFRs) located in the SFR memory map shown in Table 3-4. Individual descriptions of each SFR are provided
and reset values indicated in Tables 3-5 to 3-9.
TABLE
©2006 Silicon Storage Technology, Inc.
FIGURE
1. Bit addressable SFRs
D8H
D0H
C8H
C0H
F8H
F0H
E8H
E0H
B8H
B0H
A8H
A0H
98H
90H
88H
80H
3-4: FlashFlex51 SFR Memory Map
T2CON
WDTC
CCON
SCON
TCON
PSW
3-5: Dual Data Pointer Organization
ACC
IEA
DPS = 0 → DPTR0
DPS = 1 → DPTR1
IP1
P3
P2
P1
P0
IP
IE
B
1
1
1
1
1
1
1
AUXR1 / bit0
1
1
1
1
1
1
1
1
1
DPS
T2MOD
SADEN
SADDR
CMOD
TMOD
SFCF
SBUF
CH
CL
SP
SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD
SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD
CCAPM0
CCAP0H
CCAP0L
RCAP2L
AUXR1
SFCM
SPSR
DPL
TL0
DPH
83H
CCAPM1
CCAP1H
RCAP2H
CCAP1L
SFAL
DPH
TL1
8 BYTES
16
DPL
82H
CCAPM2
CCAP2H
CCAP2L
SFAH
TH0
TL2
DPTR1
DPTR0
CCAPM3
CCAP3H
CCAP3L
WDTD
SPCR
SFDT
TH2
TH1
P4
External Data Memory
CCAPM4
CCAP4H
CCAP4L
XICON
SPDR
AUXR
SFST
FlashFlex51 MCU
1255 F06.0
PCON
IP1H
IPH
S71255-05-000
T3-4.0 1255
FFH
F7H
EFH
E7H
DFH
D7H
CFH
C7H
BFH
B7H
AFH
A7H
9FH
97H
8FH
87H
5/06