Clearing all reset flags in MCUSR (for ATmega devices) prevents the user application from finding out the cause of the MCU reset.
I have some hardware where an LED displays some debugging information for a few minutes following a reset, but only if the reset was caused by a human (power-on, JTAG and external resets). To preserve battery life resets caused by the watchdog timer and brown-outs do not enable the LED. Pull request #22 preserves all reset flags except the watchdog which must be cleared. However when all flags are zero the user application can deduce that the cause was the watchdog timer.
Clearing all reset flags in MCUSR (for ATmega devices) prevents the user application from finding out the cause of the MCU reset.
I have some hardware where an LED displays some debugging information for a few minutes following a reset, but only if the reset was caused by a human (power-on, JTAG and external resets). To preserve battery life resets caused by the watchdog timer and brown-outs do not enable the LED. Pull request #22 preserves all reset flags except the watchdog which must be cleared. However when all flags are zero the user application can deduce that the cause was the watchdog timer.