AT89C51ED2 DATASHEET PDF

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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The four segments are: It is based on 8 inputs with programmable interrupt capability on both high or low level. The dual DPTR structure is a way by which the chip will specify the address of an external data memory location.

Page 18 Figure Tell us what’s missing.

Set by hardware when an invalid stop bit is detected. These inputs are available as alternate function of P1 and allow to exit from idle and power-down modes.

Flow Description Overview An initialization step must be performed after each Reset. Page 62 Table The programming voltage is internally generated from the standard VCC pin. It is driven by the Master for eight clock cycles which allows to exchange one Byte on the serial lines.

The command “Program Software Security Bit” can only write a higher priority level. Set to enable SPI interrupt. RST input has a pull-down resistor allowing power-on reset by simply connecting an external capacitor to V CC as shown in Figure Cleared to select 6 clock periods per peripheral clock cycle. Set to configure the SPI as a Master. From level 0, one can write level 1 or level 2. Page 54 Table Page 12 Table MODF is set to warn that there may be a multimaster conflict for system control.

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Page Port 0: Only one Master SPI device can initiate transmissions.

AT89C51ED2 Datasheet(PDF) – ATMEL Corporation

Symbol Description Symbol T Table Cleared by hardware when programming is done. The following is a list of all the characters at8951ed2 what they stand for. This output type can be used as both an input and output without the need to dtasheet the port. Setting TR2 allows TL2 to increment by the selected input.

Page 38 Table The Idle mode and the Power-Down mode. A cold start reset is the one induced by VCC switch-on. Page Table Page 74 Table Page 52 Table ISP allows devices datasneet alter their own program memory in the actual end product under software control. This page, called “Extra Flash Memory”, is not in the internal Flash program memory addressing space. This is the power supply voltage for normal, idle and power-down operation P0.

Page 44 Satasheet Page 8 Table When the pin is pulled low, it is driven strongly and able to sink a fairly large current. Page 32 It is possible to use Timer 2 as a baud rate generator and a clock generator simultaneously.

AT89C51ED2

Don’t see a manual you are looking for? Tell us about it. PCA at89c51edd2 enable bit Cleared to disable. Page 50 Slave C: Do not set this bit.

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What’s missing? Tell us about it.

Note that one ALE pulse is skipped during each access to external data memory. Page 66 Figure This is possible because when the port outputs darasheet logic high, it is weakly driven, allowing an external device to pull the pin low.

Nevertheless, during internal code execution, ALE signal is still generated.

To communicate with slaves B and C, but not slave A, the master must send an address with bits 0 and 1 both set e. The external CEX input for the module on port 1 is sampled for a transition.

The Kbytes Flash memory can be programmed either in parallel mode or in serial mode with the At89c51ex2 capability or with software. This signal must stay low for any message for a Slave. Page 46 Figure 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.

Watchdog timers are useful for systems that are susceptible to noise, power glitches, or electrostatic discharge. Set to program PCA to be gated off during idle.