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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Once the internal supply after the voltage regulator reach a safety level, the power monitor then looks at the XTAL clock input. These API are executed by the bootloader. S2 0 0 0 0 1 1 1 1 S1 S0Selected Time-out 00 – 1 machine cycles, U MOVC instruction executed from external program memory is disabled from fetching code bytes from internal memory, EA is sampled and latched on reset, and further parallel programming of the on chip code memory is disabled.

Page 34 Table Don’t see a manual you are looking for? Page 82 continue for a number of clock cycles before the internal reset algorithm takes control.


Only one Master SPI device can initiate transmissions. A cold dstasheet reset is the one induced by VCC switch-on. Cleared to select 6 clock periods per peripheral clock cycle. This signal must stay low for any message for a Slave. The second option is also not recommended if other PCA modules are being used. Figure gives a logical view of the above statements.


Hardware conditions or regular boot process. When the pin is pulled low, it is driven strongly and able to sink a fairly large current.

AT89C51ED2 Datasheet(PDF) – ATMEL Corporation

Can also be set by software. Symbol Description Datzsheet Table Page 98 Figure PCA interrupt enable bit Cleared to disable. This is the power supply voltage for normal, idle and power-down operation P0. Power-Down mode stops the oscillator, freezes all clock at known states.

Must be cleared by software. Set to enable a high level detection on Port line 7. The Idle mode and the Power-Down mode. Set to ddatasheet all interrupts.

Page 58 Table Page 76 Table Remember, the PCA timer is the time base for all modules; changing the time base for other modules would not be a good idea. Page Table The dual DPTR structure is a way att89c51ed2 which the chip will specify the address of an external data memory location. A default serial loader bootloader program allows ISP of the Flash.


Flow Description Overview An initialization step must be performed after each Reset. This can be useful if external peripherals are mapped at addresses already used by the internal XRAM. Page 66 Figure Symbol Description Symbol T Table Tell us what’s missing.

AT89C51ED2 – Microcontrollers and Processors – Microcontrollers and Processors

Set to enable timer 2 overflow interrupt. Do not try to set this bit. Datassheet 46 Figure Nevertheless, during internal code execution, ALE signal is still generated. Set to enable a high level detection on Port line 6. If the program counter ever goes astray, a match will eventually occur and cause an internal reset.

Clear to select 6 clock periods per peripheral clock cycle.

Save and disable interrupts. Setting TR2 allows TL2 to increment by the selected input.