EFM32TG210F32 Energy Micro, EFM32TG210F32 Datasheet - Page 87

• 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

10.3 Functional Description
10.3.1 Energy Modes
2010-12-21 - d0034_Rev0.90
The Energy Management Unit (EMU) is responsible for managing the wide range of energy modes
available in EFM32TG. An overview of the EMU module is shown in Figure 10.1 (p. 87) .
Figure 10.1. EMU Overview
The EMU is available as a peripheral on the peripheral bus. The energy management state machine
is triggered from the Cortex-M3 and controls the internal voltage regulators, oscillators, memories and
interrupt systems in the low energy modes. Events from the interrupt or reset systems can in turn cause
the energy management state machine to return to its active state. This is further described in the
following sections.
There are five main energy modes available in EFM32TG, called Energy Mode 0 (EM0) through Energy
Mode 4 (EM4). EM0, also called the active mode, is the energy mode in which any peripheral function
can be enabled and the Cortex-M3 core is executing instructions. EM1 through EM4, also called low
energy modes, provide a selection of reduced peripheral functionality that also lead to reduced energy
consumption, as described below.
Figure 10.2 (p. 88) shows the transitions between different energy modes. After reset the EMU will
always start in EM0. A transition from EM0 to another energy mode is always initiated by software. EM0
is the highest activity mode, in which all functionality is available. EM0 is therefore also the mode with
highest energy consumption.
The low energy modes EM1 through EM4 result in less functionality being available, and therefore also
reduced energy consumption. The Cortex-M3 is not executing instructions in any low energy mode.
Each low energy mode provides different energy consumptions associated with it, for example because
a different set of peripherals are enabled or because these peripherals are configured differently.
A transition from EM0 to a low energy mode can only be triggered by software.
A transition from EM1 – EM3 to EM0 can be triggered by an enabled interrupt or event. In addition, a chip
reset will return the device to EM0. A transition from EM4 can only be triggered by a pin reset power-
on reset, or EM4 reset wakeup request.
Cortex-M3
status registers
Control and
Peripheral bus
regulator
Voltage
system
Oscillator
system
...the world's most energy friendly microcontrollers
87
system
Energy Managem ent
Reset
State Machine
Mem ory
system
www.energymicro.com
controller
Interrupt