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9 RMU - Reset Management Unit
Quick Facts
What?
The RMU ensures correct reset operation.
It is responsible for connecting the different
0 1 2 3
4
reset sources to the reset lines of the
EFM32G.
Why?
RESETn
POWERON
BROWNOUT
A correct reset sequence is needed to
ensure safe and synchronous startup of the
EFM32G. In the case of error situations such
as power supply glitches or software crash,
the RMU provides proper reset and startup of
Reset Managem ent Unit
RESET
the EFM32G.
LOCKUP
How?
SYSRESETREQ
The Power-on Reset and Brown-out
WATCHDOG
Detector of the EFM32G provides power
line monitoring with exceptionally low power
consumption. The cause of the reset may be
read from a register, thus providing software
with information about the cause of the reset.
9.1 Introduction
The RMU is responsible for handling the reset functionality of the EFM32G.
9.2 Features
? Reset sources
? Power-on Reset (POR)
? Brown-out Detection (BOD)
? RESETn pin reset
? Watchdog reset
? Software triggered reset (SYSRESETREQ)
? Core LOCKUP condition
? A software readable register indicates the cause of the last reset
9.3 Functional Description
The RMU monitors each of the reset sources of the EFM32G. If one or more reset sources go active,
the RMU applies reset to the EFM32G. When the reset sources go inactive the EFM32G starts up. At
startup the EFM32G loads the stack pointer and program entry point from memory, and starts execution.
As seen in Figure 9.1 (p. 78) the Power-on Reset, Brown-out Detectors and RESETn pin all reset
the whole system including the Debug Interface. A Watch Dog timeout, a Core Lockup condition or a
System reset request from software resets the whole system except the Debug Interface.
Whenever a reset source is active, the corresponding bit in the RMU_RSTCAUSE register is set. At
startup the program code may investigate this register in order to determine the cause of the reset. The
register must be cleared by software.
2011-04-12 - d0001_Rev1.10
77
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