B. E./B. Tech. Degree examination, april/may 2011 Sixth Semester


Give the alternate functions for the port pins of port



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4. Give the alternate functions for the port pins of port
RD WR T TINT INT 0 TXD RXD
RD – Read data control output
WR – Write data control output
T – Timer / counter 1 external input or test pin
T – Timer / counter 0 external input or test pin
INT 1 – Interrupt 1 input pin INT 0 – interrupt 0 input pin
TXD – Transmit data pin for serial port in UART mode
RXD – Receive data pin for serial port in UART mode
5. Specify the single instruction, which clears the most significant bit of B register of 8051,

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