SST89E54RD2A(2011) View Datasheet(PDF) - Silicon Storage Technology
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SST89E54RD2A Datasheet PDF : 91 Pages
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A Microchip Technology Company
FlashFlex MCU
SST89E54RD2A/RDA / SST89E58RD2A/RDA
Not Recommended for New Designs
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 8)
AUXR1 / bit0
DPS
DPTR1
DPS = 0 → DPTR0
DPS = 1 → DPTR1
DPH
83H
DPTR0
DPL
82H
Figure 8: Dual Data Pointer Organization
External Data Memory
1339 F06.0
Special Function Registers
Most of the unique features of the FlashFlex microcontroller family are controlled by bits in special
function registers (SFRs) located in the SFR memory map shown in Table 5. Individual descriptions of
each SFR are provided and reset values indicated in Tables 6 to 10.
Table 5: FlashFlex SFR Memory Map
F8H
F0H
E8H
E0H
D8H
D0H
C8H
C0H
B8H
B0H
A8H
A0H
98H
90H
88H
80H
IP11
B1
IEA1
ACC1
CCON1
PSW1
T2CON1
WDTC1
IP1
P31
IE1
P21
SCON1
P11
TCON1
P01
CH
CL
CMOD
T2MOD
SADEN
SFCF
SADDR
SBUF
TMOD
SP
8 BYTES
CCAP0H CCAP1H CCAP2H CCAP3H CCAP4H
CCAP0L CCAP1L CCAP2L CCAP3L CCAP4L
CCAPM0
RCAP2L
CCAPM1
RCAP2H
CCAPM2
TL2
CCAPM3
SPCR
TH2
CCAPM4
SFCM
SPSR
AUXR1
SFAL
SFAH
SFDT
P4
SFST
XICON
TL0
TL1
TH0
TH1
AUXR
DPL
DPH
WDTD SPDR
IP1H
IPH
PCON
1. Bit addressable SFRs
FFH
F7H
EFH
E7H
DFH
D7H
CFH
C7H
BFH
B7H
AFH
A7H
9FH
97H
8FH
87H
T0-0.0 25114
©2011 Silicon Storage Technology, Inc.
16
DS25114A
12/11
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