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Boot sel pin not reading as high in software

Question asked by Guru Prasanth on Oct 23, 2018
Latest reply on Oct 25, 2018 by Kerry Zhou


For LPC1876 microcontroller, we are connecting the boot sel GPIO 7[5] pin with pull up resistor.

In Oscilloscope we had checked, the voltage is exactly 3.3V.

But the software read value is 0.

For checking whether boot sel pin working or not, through JTAG we had configured the corresponding BOOT SEL pin as an output pin. And then we observed output voltage same as per the set value in software.

The same issue has happened in two of our boards.

Please help us

without boot sel pin we are unable to do anything.