110
8331B–AVR–03/12
Atmel AVR XMEGA AU
• Bit 7 – Reserved
This bit is unused and reserved for future use. For compatibility with future devices, always write
this bit to zero when this register is written.
• Bit 6 – USB: USB Module
Setting this bit stops the clock to the USB module. When this bit is cleared, the peripheral should
be reinitialized to ensure proper operation.
• Bit 5 – Reserved
This bit is unused and reserved for future use. For compatibility with future devices, always write
this bit to zero when this register is written.
• Bit 4 – AES: AES Module
Setting this bit stops the clock to the AES module. When this bit is cleared, the peripheral should
be reinitialized to ensure proper operation.
• Bit 3 – EBI: External Bus Interface
Setting this bit stops the clock to the external bus interface. When this bit is cleared, the periph-
eral should be reinitialized to ensure proper operation.
• Bit 2 – RTC: Real-Time Counter
Setting this bit stops the clock to the real-time counter. When this bit is cleared, the peripheral
should be reinitialized to ensure proper operation.
• Bit 1 – EVSYS: Event System
Setting this stops the clock to the event system. When this bit is cleared, the module will con-
tinue as before it was stopped.
• Bit 0 – DMA: DMA Controller
Setting this bit stops the clock to the DMA controller. This bit can be set only if the DMA control-
ler is disabled.
8.7.2 PRPA/B – Power Reduction Port A/B register
Note: Disabling of analog modules stops the clock to the analog blocks themselves and not only the
interfaces.
• Bit 7:3 – 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 2 – DAC: Power Reduction DAC
Setting this bit stops the clock to the DAC. The DAC should be disabled before stopped.
Bit 765432 1 0
+0x01/+0x02 – – – – – DAC ADC AC PRPA/B
Read/WriteRRRRRR/WR/WR/W
Initial Value000000 0 0
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