AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 31

• 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

On-Chip ROM
bootloader
7663E–8051–10/08
FFFFh
7FFFh
Logical MCU
Address
8000h
0000h
Bank 0
Physical
Address
0FFFFh
07FFFh
08000h
00000h
The On-chip ROM bootloader (RM0) is enable only for ISP operations after reset (bootloader
execution). The RM0 memory area belongs to a logical addressable memory space called ‘Bank
Boot’.
RM0 cannot be activated from the On-chip flash memory. It means that it is not possible acti-
vate the Bank Boot area by software (it prevents any RM0 execution and flash corruption from
the user application).
RM0 logical area consists in an independent code execution memory area of 4K bytes starting
at logical 0x0000 address (it allows the use of the interrupts in the bootloader execution).
FFFFh
Logical MCU
Address
8000h
Bank 1
17FFFh
On-Chip ROM memory (RM0)
On-Chip flash code memory
External code memory
Physical
Address
10000h
FFFFh
Logical MCU
Address
8000h
Bank 2
1FFFFh
Physical
Address
18000h
Logical MCU
Address
FFFFh
8000h
Bank 3
(Ext)
AT89C51RE2
Logical MCU
Address
1000h
0000h
Bank
BOOT
ROM
Address
1000h
0000h
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