External Pin Reset (PIN)
Pull-up
Resister
Pulse
Generator
Passive
Filter
VDD
Low voltage detect (LVD)
Reset
Software watchdog reset (WDOG)
Clock generator loss of clock (LOC) reset
Clock generator loss of lock (LOL) reset
Stop mode acknowledge error (SACKERR)
Software reset (SW)
Lockup reset (LOCKUP)
MDM DAP system reset
Power-on reset (POR)
Debug reset
External Pin Reset (PIN)
Digital
Filter
Figure 21-1. Reset Sources
21.2 Reset
This section discusses basic reset mechanisms and sources. Some modules that cause
resets can be configured to cause interrupts instead. Consult the individual peripheral
chapters for more information.
21.2.1 Power-on reset (POR)
When power is initially applied to the MCU or when the supply voltage drops below the
power-on reset re-arm voltage level (V
POR
), the POR circuit causes a POR reset
condition.
As the supply voltage rises, the LVD circuit holds the MCU in reset until the supply has
risen above the LVD low threshold (V
LVD
). The POR and LVD bits in RCM_SRS
register are set following a POR.
21.2.2 System resets
Resetting the MCU provides a way to start processing from a known set of initial
conditions. System reset begins with the on-chip regulator in full regulation and system
clocking generation from an internal reference. When the processor exits reset, it
performs the following:
• Reads the start SP (SP_main) from vector-table offset 0
Reset
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