at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 27

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

Flash Memory
General Description
Features
Flash memory
organization
7663B–8051–03/07
The Flash memory increases EPROM and ROM functionality with in-circuit electrical
erasure and programming. It contains 128K bytes of program memory organized in
1024 pages of 128 bytes. This memory is both parallel and serial In-System Program-
mable (ISP). ISP allows devices to alter their own program memory in the actual end
product under software control. A default serial loader (bootloader) program allows ISP
of the Flash.
The programming does not require external high programming voltage. The necessary
high programming voltage is generated on-chip using the standard V
microcontroller.
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AT89C51RE2 features several on-chip memories:
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Flash internal program memory.
Boot vector allows user provided Flash loader code to reside anywhere in the Flash
memory space. This configuration provides flexibility to the user.
Default loader in Boot Flash allows programming via the serial port without the need
of a user provided loader.
Up to 64K byte external program memory if the internal program memory is disabled
(EA = 0).
Programming and erase voltage with standard 5V or 3V V
Flash memory FM0:
containing 128 Kbytes of program memory (user space) organized into 128 bytes
pages.
Boot ROM RM0:
4K bytes for boot loader.
8K bytes internal XRAM
CC
supply.
CC
pins of the
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