EFM32G200F16 Energy Micro, EFM32G200F16 Datasheet - Page 75

• Manufacturer Part Number: EFM32G200F16
• Description: MCU 32BIT 16KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Geckor

Specifications of EFM32G200F16

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 32MHz
• Connectivity: EBI/EMI, I²C, IrDA, SmartCard, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.8 V
• Data Converters: A/D 4x12b, D/A 1x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad
• Processor Series: EFM32G200
• Core: ARM Cortex-M3
• Data Bus Width: 32 bit
• Data Ram Size: 8 KB
• Interface Type: I2C, UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 2
• Operating Supply Voltage: 1.8 V to 3.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

9 RMU - Reset Management Unit
9.1 Introduction
9.2 Features
9.3 Functional Description
2010-09-06 - d0001_Rev1.00
The RMU is responsible for handling the reset functionality of the EFM32G.
• Reset sources
• A software readable register indicates the cause of the last reset
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. 76) 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.
0 1 2 3
• Power-on Reset (POR)
• Brown-out Detection (BOD)
• RESETn pin reset
• Watchdog reset
• Software triggered reset (SYSRESETREQ)
• Core LOCKUP condition
RESETn
SYSRESETREQ
POWERON
BROWNOUT
WATCHDOG
LOCKUP
4
Reset Managem ent Unit
...the world's most energy friendly microcontrollers
RESET
75
What?
The RMU ensures correct reset operation.
It is responsible for connecting the different
reset sources to the reset lines of the
EFM32G.
Why?
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
the EFM32G.
How?
The Power-on Reset and Brown-out
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.
Quick Facts
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