Atmel XMEGA B, User Manual

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72 XMEGA B [DATASHEET]
8291B–AVR–01/2013
6.8 Register Description
6.8.1 CHnMUX – Event Channel n Multiplexer register

Bit 7:0 – CHnMUX[7:0]: Channel Multiplexer
These bits select the event source according to Table 6-3 . This table is valid for all XMEGA devices regardless of
whether the peripheral is present or not. Selecting event sources from peripherals that are not present will give the same
result as when this register is zero. When this register is zero, no events are routed through. Manually generated events
will override CHnMUX and be routed to the event channel even if this register is zero.
Table 6-3. CHnMUX[7:0] bit settings.
Bit 7 6 5 4 3 2 1 0
CHnMUX[7:0]
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
CHnMUX[7:4] CHnMUX[3:0] Group Configuration Event Source
0000 0 0 0 0 None (manually generated events only)
0000 0 0 0 1 (Reserved)
0000 0 0 1 X (Reserved)
0000 0 1 X X (Reserved)
0000 1 0 0 0 RTC_OVF RTC overflow
0000 1 0 0 1 RTC_CMP RTC compare match
0000 1 0 1 0
USB start of frame on CH0
(2)
USB error on CH1
(2)
USB overflow on CH2
(2)
USB setup on CH3
(2)
0000 1 0 1 X (Reserved)
0000 1 1 X X (Reserved)
0001 0 0 0 0 ACA_CH0 ACA channel 0
0001 0 0 0 1 ACA_CH1 ACA channel 1
0001 0 0 1 0 ACA_WIN ACA window
0001 0 0 1 1 (Reserved)
0001 0 1 X X (Reserved)
0001 1 X X X (Reserved)
0010 0 0 0 0 ADCA_CH0 ADCA
0010 0 0 0 1 (Reserved)
0010 0 0 1 X (Reserved)
0010 0 1 X X (Reserved)