FlashFlex51 MCU
SST89E52RD2 / SST89E54RD2 / SST89E58RD2 / SST89E516RD2
SST89V52RD2 / SST89V54RD2 / SST89V58RD2 / SST89V516RD2
Preliminary Specifications
2FFH
FFH
FFH
80H
Expanded
RAM
768 Bytes
(Indirect Addressing)
(Direct Addressing)
Special
Function
Registers
(SFRs)
Upper 128 Bytes
Internal RAM
80H
7FH
Lower 128 Bytes
Internal RAM
(Indirect & Direct
Addressing)
(Indirect Addressing)
00H
000H
FFFFH
FFFFH
(Indirect Addressing)
(Indirect Addressing)
External
Data
Memory
External
Data
Memory
0300H
2FFH
Expanded RAM
000H
0000H
EXTRAM = 0
EXTRAM = 1
1255 F05.0
FIGURE
3-5: INTERNAL AND EXTERNAL DATA MEMORY STRUCTURE
©2004 Silicon Storage Technology, Inc.
S71255-00-000
3/04
16