State the use of TXD pin in 8051.
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A resonant network as quartz crystal is connected between these two pin. 8051 microcontroller also drives from external clock, then XTAL2 is used to drive 8051 from external clock and XTAL1 should be grounded. [EA(bar)]/VPP: It is and active low I/P to 8051 microcontroller.
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this pin is used to enable external programme memory.
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