111
8331B–AVR–03/12
Atmel AVR XMEGA AU
• Bit 1 – ADC: Power Reduction ADC
Setting this bit stops the clock to the ADC. The ADC should be disabled before stopped.
• Bit 0 – AC: Power Reduction Analog Comparator
Setting this bit stops the clock to the analog comparator. The AC should be disabled before
shutdown.
8.7.3 PRPC/D/E/F – Power Reduction Port C/D/E/F register
• 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 – TWI: Two-Wire Interface
Setting this bit stops the clock to the two-wire interface. When this bit is cleared, the peripheral
should be reinitialized to ensure proper operation.
• Bit 5 – USART1
Setting this bit stops the clock to USART1. When this bit is cleared, the peripheral should be
reinitialized to ensure proper operation.
• Bit 4 – USART0
Setting this bit stops the clock to USART0. When this bit is cleared, the peripheral should be
reinitialized to ensure proper operation.
• Bit 3 – SPI: Serial Peripheral Interface
Setting this bit stops the clock to the SPI. When this bit is cleared, the peripheral should be rein-
itialized to ensure proper operation.
• Bit 2 – HIRES: High-Resolution Extension
Setting this bit stops the clock to the high-resolution extension for the timer/counters. When this
bit is cleared, the peripheral should be reinitialized to ensure proper operation.
• Bit 1 – TC1: Timer/Counter 1
Setting this bit stops the clock to timer/counter 1. When thise bit is cleared, the peripheral will
continue like before the shut down.
• Bit 0 – TC0: Timer/Counter 0
Setting this bit stops the clock to timer/counter 0. When this bit is cleared, the peripheral will con-
tinue like before the shut down.
Bit 76543210
+0x03/+0x04/
+0x05/+0x06
– TWI USART1 USART0 SPI HIRES TC1 TC0 PRPC/D/E/F
Read/Write R R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
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