SST89C54-33-C-PI View Datasheet(PDF) - Silicon Storage Technology
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SST89C54-33-C-PI Datasheet PDF : 50 Pages
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FlashFlex51 MCU
SST89C54 / SST89C58
Preliminary Specifications
Data Memory
SST89C54/58 have 256 x 8 bits of on-chip RAM and can address up to 64 KBytes of external data memory.
1
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
2
and Reset values indicated in Tables 3A to 3E.
3
8 BYTES
F8
F0 B*
FF
4
F7
E8
EF
E0 ACC*
D8
E7
DF
5
D0 PSW*
D7
C8 T2CON*
RCAP2L RCAP2H TL2 TH2
CF
C0 WDTC*
B8 IP*
C7
6
BF
B0 P3* SFCF SFCM SFAL SFAH SFDT SFST
B7
A8 IE*
A0 P2*
AF
A7
7
98 SCON* SBUF
9F
90 P1*
97
88 TCON* TMOD TL0 TL1 TH0 TH1
8F
80 P0* SP DPL DPH
WDTD PCON 87
8
FlashFlex51 SFR Memory Map
* = Bit Addressable SFRs
9
All addresses are hexadecimal
344 ILL F23.1
10
SST89C54/58 Special Function Registers
11
TABLE 3A: CPU RELATED SFRS
Symbol Description
ACC* Accumulator
Direct
Bit Address, Symbol, or Alternative Port Function
Address MSB
E0h
ACC[7:0]
RESET
LSBValue
12
00h
B*
B Register
F0h
B[7:0]
00h
PSW* Program Status
D0h
CY
AC
F0 RS1 RS0 OV F1
P
00h
13
Word
SP
Stack Pointer
DPL Data Pointer
Low 0
DPH
Data Pointer
High 0
IE*
Interrupt Enable
IP*
Interrupt Priority
PCON Power Control
* = Bit Addressable SFRs
81h
82h
83h
A8h
EA
-
B8h
-
-
87h SMOD
-
SP[7:0]
DPL[7:0]
07h
00h
14
DPH[7:0]
00h
15
ET2 ES0 ET1 EX1 ET0 EX0 40h
PT2 PS PT1 PX1 PT0 PX0 xx000000b
-
-
GF1 GF0 PD IDL 0xxx0000b
16
344 PGM T3A.3
© 2000 Silicon Storage Technology, Inc.
13
344-2 8/00
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