at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 30

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

30
AT89C51RE2
When EA=0, the on-chip flash memory is disabled and the MCU core can address only
up to 64kByte of external memory (none of the on-chip flash memory FM0 banks or
RM0 can be mapped and executed).
Figure 2. Program/Code Memory Organization EA=0
FFFFh
Logical MCU
Address
0000h
Common
64K
External Physical Memory
Address
0FFFFh
00000h
On-Chip flash code memory
External code memory
7663B–8051–03/07