User manual

...the world's most energy friendly microcontrollers
2012-04-24 - Giant Gecko Family - d0053_Rev0.96 109
www.energymicro.com
Table 10.1. EMU Energy Mode Overview
EM0
1
EM1
2
EM2
2
EM3
2
EM4
2
Wakeup time to EM0 - - 2 µs 2 µs 160 µs
MCU clock tree On - - - -
High frequency peripheral clock trees On On - - -
Core voltage regulator On On - - -
High frequency oscillator On On - - -
I
2
C full functionality On On - - -
Low frequency peripheral clock trees On On On - -
Low frequency oscillator On On On - -
Real Time Counter On On On On
3
-
LCD On On On - -
LEUART On On On - -
LETIMER On On On On
3
-
LESENSE On On On On
3
-
PCNT On On On On -
ACMP On On On On -
I
2
C receive address recognition On On On On -
Watchdog On On On On
3
-
Pin interrupts On On On On -
RAM voltage regulator/RAM retention On On On On -
Brown Out Reset On On On On -
Power On Reset On On On On On
Pin Reset On On On On On
GPIO state retention On On On On On
4
EM4 Reset Wakeup Request - - - - On
4
Backup RTC On On On On On
Backup retention registers On On On On On
1
Energy Mode 0/Active Mode
2
Energy Mode 1/2/3/4
3
When the 1 kHz ULFRCO is selected
4
Not available in Backup mode
The different Energy Modes are summarized in the following sections.
10.3.1.1 EM0
• The high frequency oscillator is active
• High frequency clock trees are active
• All peripheral functionality is available
10.3.1.2 EM1
• The high frequency oscillator is active