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Table 3.1. Energy Mode Description
Energy Mode
Name
Description
0 1 2 3
0 1 2 3
4
4
EM0 – Energy Mode 0
(Run mode)
EM1 – Energy Mode 1
(Sleep Mode)
In EM0, the CPU is running and consuming as little as 180 μA/MHz, when
running code from flash. All peripherals can also be activated.
In EM1, the CPU is sleeping and the power consumption is only 45 μA/MHz .
The peripherals including, DMA, PRS and memory system is still available.
In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz
PCNT, WDOG, LEUART, I C, ACMP ) are still available, giving a high degree
0   1   2   3
4
EM2 – Energy Mode 2
(Deep Sleep Mode)
oscillator running, selected low energy peripherals (LCD, RTC, LETIMER,
2
of autonomous operation with a current consumption as low as 0.9 μA with
RTC enabled. Power-on Reset, Brown-out Detection and full RAM and CPU
retention is also included.
In EM3 the low-frequency oscillator is disabled, but there is still full CPU and
external interrupt, PCNT, and I C can wake-up the device. Even in this mode,
0   1   2   3
4
EM3 - Energy Mode 3
(Stop Mode)
RAM retention, as well as Power-on Reset, Pin reset and Brown-out Detector,
with a consumption of only 0.6 μA. The low-power ACMP, asynchronous
2
the wake-up time is in the range of a few microseconds.
EM4 – Energy Mode 4
In EM4, the current is down to 20 nA and all chip functionality is turned off
0 1 2 3
4
(Shutoff Mode)
except the pin reset and the power on reset. All pins are put into their reset
state.
3.5 Product Overview
Table 3.2 (p. 9) shows a device overview of the EFM32G Microcontroller Series, including peripheral
functionality. For more information, the reader is referred to the device specific datasheets.
2011-04-12 - d0001_Rev1.10
8
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