FlashFlex51 MCU
SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD
SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD
Data Sheet
2FFH
Expanded
RAM
768 Bytes
FFH
(Indirect Addressing)
FFH
Upper 128 Bytes
80H
Internal RAM
80H
7FH
Lower 128 Bytes
Internal RAM
(Direct Addressing)
Special
Function
Registers
(SFRs)
000H
(Indirect Addressing)
(Indirect & Direct
00H
Addressing)
FFFFH
(Indirect Addressing) FFFFH
External
Data
Memory
(Indirect Addressing)
External
Data
Memory
2FFH
000H
Expanded RAM
0300H
EXTRAM = 0
0000H
EXTRAM = 1
1255 F05.0
FIGURE 3-4: Internal and External Data Memory Structure
©2006 Silicon Storage Technology, Inc.
15
S71255-05-000
5/06