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I want to know about transmiting and receiving data between 8051(master)and two 8051 (slave),please show me byte address to transmit between them thanks !
Have you looked at the 9-bit ("multiprocessor") mode of the serial port? See Intel Application Note AP-410, "Enhanced Serial Port on the 83C51FA" http://www.intel.com/design/mcs51/applnots/270490.htm Note that these "Enhanced" features are also in many non-intel variants.