EFM32TG210F32 Energy Micro, EFM32TG210F32 Datasheet - Page 82

• Manufacturer Part Number: EFM32TG210F32
• Description: MCU 32BIT 32KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Tiny Geckor

Specifications of EFM32TG210F32

• 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: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K 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: EFM32
• Core: ARM Cortex-M3
• Data Bus Width: 32 bit
• Data Ram Size: 32 KB
• Interface Type: UART, I2C, SPI
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 1
• Operating Supply Voltage: 1.8 V to 3.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Processor To Be Evaluated: EFM32TG210
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

9.3.2 Power-On Reset (POR)
9.3.3 Brown-Out Detector Reset (BOD)
2010-12-21 - d0034_Rev0.90
Table 9.1. RMU Reset Cause Register Interpretation
Note
The POR ensures that the EFM32TG does not start up before the supply voltage V
the threshold voltage VPORthr (see Device Datasheet Electrical Characteristics for details). Before the
threshold voltage is reached, the EFM32TG is kept in reset state. The operation of the POR is illustrated
in Figure 9.2 (p. 82) , with the active low POWERONn reset signal. The reason for the “unknown”
region is that the corresponding supply voltage is too low for any reliable operation.
Figure 9.2. RMU Power-on Reset Operation
The EFM32TG has 4 brownout detectors, one for the unregulated 3.0 V power, one for the regulated
1.8 V power, one for Analog Power Domain 0 (AVDD0), and one for Analog Power Domain 1 (AVDD1).
The BODs are constantly monitoring the voltages. Whenever the unregulated or regulated power drops
below the VBODthr value (see Electrical Characteristics for details), or if the AVDD0 or AVDD1 drops
below the voltage at the decouple pin, the corresponding active low BROWNOUTn line is held low. The
BODs also include hysteresis, which prevents instability in the corresponding BROWNOUTn line when
the supply is crossing the VBODthr limit or the AVDD bods drops below decouple. The operation of the
BOD is illustrated in Figure 9.3 (p. 83) . The “unknown” regions are handled by the POR module.
Register Value
0bXXX XXXX XXX1
0bXXX XXXX XX10
0bXXX XXX0 0100
0bXXX XXXX 1X00
0bXXX XXX1 XX00
0bXXX XX10 0000
0b000 01X0 0000
0b000 1000 0XX0
0b001 1000 0XX0
0b010 0000 0000
0b100 0000 0000
When exiting EM4 with external reset, both the BODREGRST and BODUNREGRST in
RSTCAUSE might be set (i.e. are invalid)
POWERONn
VPORthr
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.
The system as woken up from EM4.
The system as woken up from EM4 on an EM4 wakeup reset request from pin.
A Brown-out has been detected on Analog Power Domain 0 (AVDD0).
A Brown-out has been detected on Analog Power Domain 1 (AVDD1).
V
Unknown
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