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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Page 98 Figure During the time that execution resumes, the internal RAM cannot be accessed; however, it is possible at89f51ed2 the Port pins to be accessed. Page 74 Table Page Port 0: Do not set this bit 6 – Reserved The value read from this bit is indeterminate. PCA interrupt enable bit Cleared to disable.

Hardware conditions or regular boot process. Set by hardware when VCC rises from datasheeg to its nominal voltage. It contains 64K bytes of program memory organized respectively in pages of bytes.


Remember, the PCA timer is the time base for all modules; changing at8951ed2 time base for other modules would not be a good idea. Set to select 12 clock periods per peripheral clock cycle. VIH min changed from 0. Page 8 Table This page, called “Extra Flash Memory”, is not in the internal Flash program memory addressing space.

  ISO 8573-2 PDF

Setting TR2 allows TL2 to increment by the selected input. It is obvious that only one Master SS high level can drive the network. Nevertheless, during internal code execution, ALE signal is still generated. The dual DPTR structure is a way by which at89c51de2 chip will specify the address of an external data memory location. By default, Standard mode is active.

AT89C51ED2 Datasheet(PDF) – ATMEL Corporation

An internal counter will count clock periods before the reset is de-asserted. Do not set this bit 5 – Reserved The value read from this bit is indeterminate. Set to enable timer 2 overflow interrupt. Page 52 Table If the program counter ever goes astray, a match will eventually occur and cause an internal reset.

RST input has a pull-down resistor allowing power-on reset by simply connecting an external capacitor to V CC as shown in Figure Page 12 Table Do not set this bit. Set to enable KBF.

This is possible because when the port outputs a logic high, it is weakly driven, allowing an external device to pull the pin low. Page 42 Table This can be useful if external peripherals are mapped at addresses already used by the internal XRAM.


Set to enable a high level detection on Port line 7. This bit is set by hardware when a transfer has been completed.

Atmel – datasheet pdf

The status of the Port pins during Power-Down mode is detailed in Table Set to enable SPI interrupt. Page 44 Figure Note that one ALE pulse is skipped during each access to external data memory.

These inputs are available as alternate function of P1 and allow to exit from idle and power-down modes. Page 76 Table Ordering Information Table Page 46 Figure Thus, in most applications the first solution is the best option. Its advantages include reduced software overhead and improved accuracy.

Set to enable all interrupts.

Don’t see a manual you are looking for? The Kbytes Flash memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. These interrupts are shown in Figure The command “Program Software Security Bit” can only write a higher priority level. Flow Description Overview An initialization step datashert be performed after each Reset.