0 – July. 1. Qualification Package. AT89C51ED2. FLASH 8-bit C51 Microcontroller. 64 Kbytes FLASH, 2 Kbytes EEPROM. AT89C51RD2 / AT89C51ED2. AT89C51ED2-SLSUM Microchip Technology / Atmel 8-bit Microcontrollers – MCU 64kB Flash B RAM VV datasheet, inventory, & pricing. AT89C51ED2-SLSIM Microchip Technology / Atmel 8-bit Microcontrollers – MCU 80C31 w/4k datasheet, inventory, & pricing.

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Do not set this bit 5 – Reserved The value read from this bit is indeterminate. Page 18 Figure Ordering Information Table There are three levels of security: Page 76 Table The second option is also not recommended if other PCA modules are being used. Oscillator To optimize the power consumption and execution time needed for a specific task, an internal prescaler feature has been implemented between the oscillator and the CPU and peripherals.

Set to enable SPI interrupt. Can not be set or cleared by software.


By default, Standard mode is active. Nevertheless, during internal code execution, ALE signal is still generated. This output type can be used as both an input and output without the need to reconfigure the port.

Output pulse for latching the low byte of the address during an access to external memory. Page 66 Figure Can also be set by software.

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A default serial loader bootloader program allows ISP of the Flash. It is possible to use Timer 2 as a baud rate generator and a clock generator simultaneously. Page 38 Table Page 78 Table It contains 64K bytes of program at89c51ee2 organized respectively in pages of bytes. In this case, the SPI system is affected in the following ways: These API are executed by the bootloader.

From dafasheet 0, one can write level 1 or level 2. Its advantages include reduced software overhead and improved accuracy. Only one Master SPI device can initiate transmissions.


AT89C51ED2 Datasheet(PDF) – ATMEL Corporation

Page 90 Figure Thus, in most applications the first solution is the best option. Page 50 Slave C: Set to enable keyboard interrupt. Flow Description Overview An initialization step must be performed after each Reset. Page 98 Figure At89c51ed22 Revision History Page 32 It is possible to use Timer 2 as a baud rate generator and a clock generator simultaneously. Page 34 Table Set by hardware when an invalid stop bit is detected. This signal must stay low for any message for a Slave.

The dual DPTR structure at98c51ed2 a way by which the chip will specify the address of an external data memory location.

Do not set this bit.