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SST89C54 Datasheet(PDF) 13 Page - Silicon Storage Technology, Inc

Part # SST89C54
Description  FlashFlex51 MCU
PDF  50 Pages
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Manufacturer  SST [Silicon Storage Technology, Inc]
Direct Link  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST89C54 Datasheet(HTML) 13 Page - Silicon Storage Technology, Inc

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© 2000 Silicon Storage Technology, Inc.
344-2 8/00
FlashFlex51 MCU
SST89C54 / SST89C58
Preliminary Specifications
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Data Memory
SST89C54/58 have 256 x 8 bits of on-chip RAM and can address up to 64 KBytes of external data memory.
Special Function Registers (SFR)
Most of the unique features of the FlashFlex51 microcontroller family are controlled by bits in special function registers
(SFRs) located in the FlashFlex51 SFR Memory Map shown below. Individual descriptions of each SFR are provided
and Reset values indicated in Tables 3A to 3E.
F8
F0
E8
E0
D8
D0
C8
C0
B8
B0
A8
A0
98
90
88
80
FF
F7
EF
E7
DF
D7
CF
C7
BF
B7
AF
A7
9F
97
8F
87
B*
ACC*
PSW*
T2CON*
RCAP2L RCAP2H TL2
TH2
WDTC*
IP*
P3*
SFCF
SFCM
SFAL
SFAH
SFDT
SFST
IE*
P2*
SCON* SBUF
P1*
TCON* TMOD
TL0
TL1
TH0
TH1
P0*
SP
DPL
DPH
WDTD PCON
8 BYTES
FlashFlex51 SFR Memory Map
* = Bit Addressable SFRs
All addresses are hexadecimal
344 ILL F23.1
SST89C54/58 Special Function Registers
TABLE 3A: CPU RELATED SFRS
Symbol Description
Direct
Bit Address, Symbol, or Alternative Port Function
RESET
Address
MSB
LSBValue
ACC*
Accumulator
E0h
ACC[7:0]
00h
B*
B Register
F0h
B[7:0]
00h
PSW*
Program Status
D0h
CY
AC
F0
RS1
RS0
OV
F1
P
00h
Word
SP
Stack Pointer
81h
SP[7:0]
07h
DPL
Data Pointer
82h
DPL[7:0]
00h
Low 0
DPH
Data Pointer
83h
DPH[7:0]
00h
High 0
IE*
Interrupt Enable
A8h
EA
-
ET2
ES0
ET1
EX1
ET0
EX0
40h
IP*
Interrupt Priority
B8h
-
-
PT2
PS
PT1
PX1
PT0
PX0
xx000000b
PCON
Power Control
87h
SMOD
-
-
-
GF1
GF0
PD
IDL
0xxx0000b
* = Bit Addressable SFRs
344 PGM T3A.3



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