User manual
...the world's most energy friendly microcontrollers
2012-04-24 - Giant Gecko Family - d0053_Rev0.96 117
www.energymicro.com
10.4 Register Map
The offset register address is relative to the registers base address.
Offset Name Type Description
0x000 EMU_CTRL RW Control Register
0x004 EMU_MEMCTRL RW Memory Control Register
0x008 EMU_LOCK RW Configuration Lock Register
0x024 EMU_AUXCTRL RW Auxiliary Control Register
0x02C EMU_EM4CONF RW Energy mode 4 configuration register
0x030 EMU_BUCTRL RW Backup Power configuration register
0x034 EMU_PWRCONF RW Power connection configuration register.
0x038 EMU_BUINACT RW Backup mode inactive configuration register.
0x03C EMU_BUACT RW Backup mode active configuration register.
0x040 EMU_STATUS R status register
0x044 EMU_ROUTE RW I/O Routing Register
0x048 EMU_IF R Interrupt Flag Register
0x04C EMU_IFS W1 Interrupt Flag Set Register
0x050 EMU_IFC W1 Interrupt Flag Clear Register
0x054 EMU_IEN RW Interrupt Enable Register
0x058 EMU_BUBODBUVINCAL RW BU_VIN Backup BOD calibration
0x05C EMU_BUBODUNREGCAL RW Unregulated power Backup BOD calibration
10.5 Register Description
10.5.1 EMU_CTRL - Control Register
Offset Bit Position
0x000
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
Access
RW
RW
RW
Name
EM4CTRL
EM2BLOCK
EMVREG
Bit Name Reset Access Description
31:4 Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
3:2 EM4CTRL 0x0 RW Energy Mode 4 Control
This register is used to enter Energy Mode 4, in which the device only wakes up from an external pin reset, from a power cycle,
Backup RTC interrupt, or EM4 wakeup reset request. Energy Mode 4 is entered when the EM4 sequence is written to this bitfield.
1 EM2BLOCK 0 RW Energy Mode 2 Block
This bit is used to prevent the MCU to enter Energy Mode 2 or lower.
0 EMVREG 0 RW Energy Mode Voltage Regulator Control
Control the voltage regulator in low energy modes 2 and 3.
Value Mode Description
0 REDUCED Reduced voltage regulator drive strength in EM2 and EM3.