EFM32G200F16 Energy Micro, EFM32G200F16 Datasheet - Page 285

• 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

21 LETIMER - Low Energy Timer
21.1 Introduction
21.2 Features
2010-09-06 - d0001_Rev1.00
The unique LETIMER
in addition to EM1 and EM0. Because of this, it can be used for timing and output generation when most
of the device is powered down, allowing simple tasks to be performed while the power consumption of
the system is kept at an absolute minimum.
The LETIMER can be used to output a variety of waveforms with minimal software intervention. It is
also connected to the Real Time Counter (RTC), and can be configured to start counting on compare
matches from the RTC.
• 16-bit down count timer
• 2 Compare match registers
• Compare register 0 can be top timer top value
• Compare registers can be double buffered
• Double buffered 8-bit Repeat Register
• Same clock source as the Real Time Counter
• LETIMER can be triggered (started) by an RTC event or by software
• 2 output pins can optionally be configured to provide different waveforms on timer underflow:
• Interrupt on:
0 1 2 3
• Toggle output pin
• Apply a positive pulse (pulse width of one LFACLK
• PWM
• Compare matches
• Timer underflow
4
EFM 3 2 M CU
LETIM ER
RTC
TM
, the Low Energy Timer, is a 16-bit timer that is available in energy mode EM2
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285
LETIMER
What?
The LETIMER is a down-counter that can
keep track of time and output configurable
waveforms. Running on a 32.768 kHz clock
the LETIMER is available even in EM2 with
sub µA current consumption.
Why?
The LETIMER can be used to provide
repeatable waveforms to external
components while remaining in EM2. It is well
suited for e.g. metering systems or to provide
more compare values than available in the
RTC.
How?
With buffered repeat and top value registers,
the LETIMER can provide glitch-free
waveforms at frequencies up to 16 kHz.
It is tightly coupled to the RTC, which
allows advanced time-keeping and wake-up
functions in EM2.
period)
Quick Facts
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