User manual

...the world's most energy friendly microcontrollers
2012-04-24 - Giant Gecko Family - d0053_Rev0.96 120
www.energymicro.com
Bit Name Reset Access Description
When set, the voltage regulator is enabled in EM4, enabling operation of the Backup RTC and retention registers.
10.5.6 EMU_BUCTRL - Backup Power configuration register
Offset Bit Position
0x030
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9 8 7 6 5 4 3 2 1 0
Reset
0x0
0 0 0
Access
RW RW RW RW
Name
PROBE
BODCAL STATEN
EN
Bit Name Reset Access Description
31:7 Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
6:5 PROBE 0x0 RW Voltage probe select
Configure which voltage to export to ADC
Value Mode Description
0 DISABLE Disable voltage probe
1 VDDDREG Connect probe to VDD_DREG
2 BUIN Connect probe to BU_IN
3 BUOUT Connect probe to BU_OUT
4:3 Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
2 BODCAL 0 RW Enable BOD calibration mode
When set, the Backup BOD sensing on VDD_DREG will be sensing the DAC output.
1 STATEN 0 RW Enable backup mode status export.
When enabled, BU_STAT will indicate when backup mode is active.
0 EN 0 RW Enable backup mode
Backup mode will be entered when main power browns out and backup battery is present.
10.5.7 EMU_PWRCONF - Power connection configuration register.
Offset Bit Position
0x034
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9 8 7 6 5 4 3 2 1 0
Reset
0x0
0 0 0
Access
RW RW RW RW
Name
PWRRES
VOUTSTRONG
VOUTMED
VOUTWEAK
Bit Name Reset Access Description
31:5 Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
4:3 PWRRES 0x0 RW Power domain resistor select
Select value of series resistor between main power domain and backup power domain.
Value Mode Description
0 RES0 Main power and backup power connected with RES0 series resistance.