EFM32G200F64 Energy Micro, EFM32G200F64 Datasheet - Page 76

• Manufacturer Part Number: EFM32G200F64
• Description: MCU 32BIT 64KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Geckor

Specifications of EFM32G200F64

• 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: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K 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: 16 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

9.3.1 RMU_RSTCAUSE Register
9.3.2 Power-On Reset (POR)
2010-09-06 - d0001_Rev1.00
Figure 9.1. RMU Reset Input Sources and Connections.
The RMU_RSTCAUSE register indicates the reason for the last reset. The register should be cleared
after the value has been read at startup. Otherwise the register may indicate multiple causes for the
reset at next startup. The following procedure must be done to clear RMU_RSTCAUSE:
1. Write a 1 to RCCLR in RMU_CMD
2. Write a 1 to bit 0 in EMU_AUXCTRL
3. Write a 0 to bit 0 in EMU_AUXCTRL
RMU_RSTCAUSE should be interpreted according to Table 9.1 (p. 76) . X bits are don't care. Notice
that it is possible to have multiple reset causes. For example, an external reset and a watchdog reset
may happen simultaneously.
Table 9.1. RMU Reset Cause Register Interpretation
Note
The POR ensures that the EFM32G does not start up before the supply voltage V
the threshold voltage VPORthr (see Device Datasheet Electrical Characteristics for details). Before the
Register Value
0bXXX XXX1
0bXXX XX10
0bXX0 0100
0bXXX 1X00
0bXX1 XX00
0bX10 0000
0b1X0 0000
V
RESETn
DD_REGULATED
SYSREQRST
V
LOCKUP
WDOG
LOCKUPRDIS
DD
When exiting EM4 with external reset, both the BODREGRST and BODUNREGRST in
RSTCAUSE might be set (i.e. are invalid)
POR
BOD
BOD
Filter
BROWNOUT_UNREGn
BROWNOUT_REGn
RCCLR
Reset Managem ent Unit
RMU_RSTCAUSE
POWERONn
Edge-to-pulse
filter
Cause
A Power-on Reset has been performed. X bits are don't care.
A Brown-out has been detected on the unregulated power.
A Brown-out has been detected on the regulated power.
An external reset has been applied.
A watchdog reset has occurred.
A lockup reset has occurred.
A system request reset has occurred.
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PORESETn
SYSRESETn
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Interface
Debug
DD
Peripherals
Core
has reached
Cortex-M3