AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 27

• Manufacturer Part Number: AT89C51RE2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RE2

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Uart: 2
• Sram (kbytes): 8.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/OCD
• Watchdog: Yes

Flash Memory
General
Description
Features
Flash memory
organization
7663E–8051–10/08
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 Programmable (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 pro-
gramming voltage is generated on-chip using the standard V
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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
CC
pins of the microcontroller.
supply.
AT89C51RE2
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