AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 2

• 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

2
5. Flash
MCU
configuration
When the bank1 or the bank2 is mapped in the upper 32K, if the application running in the
common bank wants to program data in common bank or bank0, the same data are dupli-
cated in bank1 or bank2.
Workaround
When the application requires program data in a specific bank, set the MBO2 bit at 0 in
BMSEL register for flash programming operations. This means it is not possible to program
common bank or bank0 from bank1 or bank2.
Common
Bank0
Bank1
Bank2
bank
–
Bank1 or bank2 corruption while programming bank0 or common bank
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
then the data
read from ...
Common Bank
Bank0
Bank1
Bank0
is ...
OK
OK
OK
OK
is ...
OK
OK
OK
OK
is ...
OK
OK
OK
OK
is ...
OK
OK
OK
with upper 32K mapped with ...
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
then the data
read from ...
Common Bank
Bank0
Bank1
Bank1
is ...
OK
OK
Corrupted
OK
is ...
OK
OK
OK
Corrupted
is ...
OK
OK
OK
OK
is ...
OK
OK
OK
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
then the data
read from ...
Common Bank
Bank0
Bank1
Bank2
7665D–8051–03/08
is ...
OK
OK
Corrupted
OK
is ...
OK
OK
OK
Corrupted
is ...
OK
OK
OK
OK
is ...
OK
OK
OK