19.4.2.6 User Reset

The User reset is entered when a low level is detected on the NRST pin and RSTC_MR.URSTEN =1. If URSTASYNC=1, a falling edge of the NRST input signal immediately asserts internal reset lines. If URSTASYNC=0, the NRST input signal is resynchronized and internal reset lines are asserted once a falling edge has been detected on the resynchronized NRST input signal.

The Processor reset and the Peripheral reset are asserted.

The User reset is released when NRST rises, after a two-cycle resynchronization time and a 2-cycle processor start-up. The processor clock is re-enabled as soon as NRST is confirmed high.

When the Processor reset signal is released, RSTC_SR.RSTTYP is loaded with the value 0x4, indicating a User reset.

The NRST manager ensures that the NRST_OUT line is asserted as programmed in the field ERSTL. However, if NRST is driven low externally, the internal reset lines remain asserted until NRST rises.