Datasheet

101
XMEGA B [DATASHEET]
8291B–AVR–01/2013
8.6 Register Description – Sleep
8.6.1 CTRL – Control Register
 Bit 7:4 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to zero
when this register is written.
 Bit 3:1 – SMODE[2:0]: Sleep Mode selection
These bits select sleep modes according to Table 8-2.
Table 8-2. Sleep mode selection.
 Bit 0 – SEN: Sleep Enable
This bit must be set to make the MCU enter the selected sleep mode when the SLEEP instruction is executed. To avoid
unintentional entering of sleep modes, it is recommended to write SEN just before executing the SLEEP instruction and
clear it immediately after waking up.
8.7 Register Description – Power Reduction
8.7.1 PRGEN – General Power Reduction register
 Bit 7 – LCD: LCD Module
Setting this bit stops the clock to the LCD module. When the bit is cleared the peripheral should be reinitialized to ensure
proper operation.
Bit 76543210
+0x00
– – – – SMODE[2:0] SEN
Read/Write R R R R R/W R/W R/W R/W
Initial Value 00000000
SMODE[2:0] Group configuration Description
000 IDLE Idle mode
001 – Reserved
010 PDOWN Power-down mode
011 PSAVE Power-save mode
100 – Reserved
101 – Reserved
110 STDBY Standby mode
111 ESTDBY Extended standby mode
Bit 7 6 5 4 3 2 1 0
+0x00 LCD USB
– AES – RTC EVSYS DMA
Read/Write R/W R/W R R/W R R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0