1. Frequently Asked Questions (FAQs)
Problem 1: Intermittent start-up issues during power up or some devices will not start-up at all.
Problem 2: Intermittent start-up, wake from low power modes or analog repeatability issues.
Problem 3: Intermittent start-up and/or lock up issues on power-up.
Problem 4: Intermittent MCU POR, BOR, BOD reset issues during start-up resulting in exception errors or lock ups.
Problem 5: Some PIC32MZxxEFxx devices are intermittently not starting up when using primary oscillator with
crystal.
Problem 6: A PIC32MZxxEFxx is running at 200Mhz and there are lockups or exceptions errors on some devices.
Problem 7: An external clock is being used with the MCU in EC mode, a clock is being input to the MCU, but nothing
is happening.
Problem 8: Using a crystal with automatic gain control enabled, POSCAGC=1, and getting a clock fail detect.
Problem 9: Using auto gain control but seeing intermittent start-up issues on some boards and/or over temperature.
Problem 10: The MCU operating frequency is not as expected or no MCU code is executing.
Problem 1
1: Trying to clock switch from FRC to FRC w/PLL, but the system clock is still only 8Mhz and/or the
OSCCON.OSWEN bit indicates the clock switch never completed.
Problem 12: Sometimes a reset happens on a wake from sleep, or during a clock switch.
Problem 13: A lock-up sometimes occurs during a power anomaly or when power cycling the application.
Problem 14: Sometimes after hours, a lock-up occurs.
Problem 15: The device does not function. It is continuously stuck in a hard fault or a reset.
Problem 16: The PC does not recognize ICD4 and/or PICKIT 4.
Problem 17: In debug mode why are some PIC32MX/ PIC32MM/ PIC32MZ/ PIC32MK registers values not showing
as expected?
Problem 18: Unable to connect with ICD4 or RealIce to target.
Problem 19: Programming works, but not the debug.
Problem 20: What needs to be done with the exposed pad on the MCU package for the PCB design?
Problem 21: Some of I/O pins and/or alternate function pins are not working at all even though they are configured
correctly.
Problem 22: MPLAB does not connect to the PIC32 target device.
Problem 23: Do bypass caps need to be used on the VBAT input pin?
Problem 24: The external battery voltage cannot be measured correctly using the ADC.
Problem 25: There is frequent to intermittent data corruption between the MCU and target IC.
Problem 26: There is intermittent data corruption on communication links between remote PCB stations or
equipment.
Problem 27: Clock and data are present, but the target SPI device it is not responding.
Problem 28: Why is the SPI data always shifted by one bit?
Problem 29: Why is the SPI /SQI data corrupted?
Problem 30: The SD Card will not write or erase, only read.
Problem 31: The SD Card cannot be accessed.
Problem 32: Why is the UART data corrupted?
Problem 33: Why is the first UART byte always wrong after a power-up or wake from sleep?
Frequently Asked Questions (F
AQs)
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Manual
DS70005439B-page 4
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