FlashFlex51 MCU
SST89E52RD2 / SST89E54RD2 / SST89E58RD2 / SST89E516RD2
SST89V52RD2 / SST89V54RD2 / SST89V58RD2 / SST89V516RD2
Preliminary Specifications
TABLE 3-11: INTERFACE SFRS
Bit Address, Symbol, or Alternative Port Function
Direct
Address
RESET
Value
Symbol Description
MSB
LSB
SBUF
Serial Data Buffer
99H
SBUF[7:0]
Indeterminate
00H
SCON1 Serial Port Control
98H
SM0/FE SM1
SM2
REN
TB8
RB8
TI
RI
SADDR Slave Address
A9H
SADDR[7:0]
SADEN[7:0]
00H
SADEN Slave Address
Mask
B9H
00H
SPCR
SPI Control
Register
D5H
AAH
SPIE
SPIF
SPE DORD MSTR CPOL CPHA SPR1 SPR0
WCOL
04H
00H
SPSR
SPI Status
Register
SPDR
P01
P11
P21
P31
SPI Data Register
Port 0
86H
80H
90H
A0H
B0H
A5H
SPDR[7:0]
P0[7:0]
00H
FFH
FFH
FFH
FFH
Port 1
-
-
-
-
-
-
T2EX
T2
Port 2
P2[7:0]
Port 3
RD#
1
WR#
1
T1
1
T0
1
INT1# INT0# TXD
P4.3 P4.2 P4.1
RXD
P4.0
P42
Port 4
FFH
T3-11.0 1255
1. Bit Addressable SFRs
2. P4 is similar to P1 and P3 ports
©2004 Silicon Storage Technology, Inc.
S71255-00-000
3/04
20
SST [ SILICON STORAGE TECHNOLOGY, INC ]
