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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This is the power supply voltage for normal, idle and power-down operation P0. Your manual failed to upload Page 62 Table These inputs are available as alternate function of P1 and allow to exit from idle and power-down modes. By default, Standard mode is active.

RST input has a pull-down resistor allowing power-on reset by simply connecting an external capacitor to V CC as shown in Figure Hardware conditions or regular boot process.

Generate an enabled external Keyboard interrupt same behavior as external interrupt. Page Port 0: Must be cleared by software. Oscillator To optimize the power consumption and execution time needed for a specific task, an internal prescaler feature has been implemented between qt89c51ed2 oscillator and the CPU and peripherals.

Atmel – datasheet pdf

All other vectors addresses are the same as standard C52 devices. Clear to select 6 clock periods per peripheral clock cycle. Output pulse for latching the low at89c51e2d of the address during an access to external memory.


MODF is set to warn that there may be a multimaster conflict for system control. Its advantages include reduced software overhead and improved accuracy.

The dual DPTR structure is a way by which the chip will specify the address of an external data memory location. Page Table Page 56 Table Page 12 Table Setting TR2 allows TL2 datashert increment by the selected input. The WDT is by default disabled from exiting reset.

Fatasheet to select 12 clock periods per peripheral clock cycle. A warm start reset occurs while VCC is still applied to the device and could be generated for example by an exit from power-down. Set by hardware when an invalid stop bit is detected.

Do not set this bit 6 – Reserved The value read from this bit is indeterminate. When the communication is initialized, the protocol depends on the record type requested by the host. This is achieved by dataeheet an internal reset to them. Page 76 Table Set to program PCA to be gated off during idle. The Kbytes Flash memory can be programmed either qt89c51ed2 parallel mode or in serial mode with the ISP capability or with software. Remember, the PCA timer is the time base for all modules; changing the time base for other modules would not be a good idea.

Do not set this bit. Only one Master SPI device can initiate transmissions.

Tell us what’s missing. Can not be set or cleared by software. Page 10 NIC P2. Do not try to set this bit.


It contains 64K bytes of program memory organized at89c51ed in pages of bytes. PCA interrupt enable bit Cleared to disable. It is possible to use Timer 2 as a baud rate generator and a clock generator simultaneously.

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Document Revision History It contains a Kbyte Flash memory block for code and for data. Save and disable interrupts. To communicate with slaves B and C, but not slave A, the master wt89c51ed2 send an address with bits 0 and 1 both set e. S2 0 0 0 0 1 1 1 1 S1 S0Selected Time-out 00 – 1 machine cycles, The Idle mode and the Power-Down mode.

at899c51ed2 Page 32 It is possible to use Timer 2 as a baud rate generator and a clock generator simultaneously. This output type can be used as both an input and output without the need to reconfigure the port. Set to enable SPI interrupt. From level 0, one can write level 1 or level 2.

This is possible because when the port outputs a logic high, it is weakly driven, datasheer an external device to pull the pin low. Page 82 continue for a number of clock cycles before the internal reset algorithm takes control.