Port 2 outputs the high byte of the external memory address when the address is 16 bits wide. In this application, Port 0 outputs the low byte of the external memory address, time-multiplexed with the byte being written or read. The output drivers of Ports 0 and 2, and the input buffers of Port 0, are used in accesses to external memory. I love you jaan themes downloadĪT89 Series Microcontrollers edit Device name Flash memory size Data memory size AT89C1051 1K Flash 64 bytes RAM AT89C2051 2K Flash 128 bytes RAM AT89C4051 4K Flash 128 bytes RAM AT89C51S51 4K Flash 128 bytes RAM AT89C52S52 8K Flash 256 bytes RAM AT89C55 20K Flash 256 bytes RAM AT89S8252 8K Flash 256 bytes RAM AT89S53 12K Flash 256 bytes RAM Port Structures and Operation edit All four ports in the AT89C51 and AT89C52 are bidirectional.Įach consists of a latch (Special Function Registers P0 through P3), an output driver, and an input buffer. More recently, the AT89 series has been augmented with 8051-cored special function microcontrollers, specifically in the areas of USB, IC (two wire interface), SPI and CAN bus controllers, MP3 decoders and hardware PWM.Ītmel has also created an LP (low power) series of these chips with a Single Cycle Core, making the execution speed of these chips considerably faster. While less powerful than the newer AT90 series of AVRRISC microcontrollers, new product development has continued with the AT89 series for the aforementioned advantages. This allows a great amount of legacy code to be reused without modification in new applications. Versatile 8-bit CPU with Flash memory on a monolithic chip, the Atmel AT 89C51.Ītmels high-density nonvolatile memory technology and is compatible with the indus- try-standard 80C51 instruction set and pinout.
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