The power-down sequence can be triggered as depicted in Figure 8-12. In all cases, NRST is asserted in the first sequencing slot, while ENx are de-asserted as per the configuration in PWR_ENx registers, see Table 8-31. In case of NPWR_BTN enabled, the "t long press" is determined as per register LP_TTSHLD shown in
Table 8-21.

Power-down from sleep differs from power-down from active as some ENx might be already de-asserted as part of the sleep entry sequence. In the power-down from sleep sequence, the remaining ENx are de-asserted as per the configuration in PWR_ENx registers.