Datasheet

ii
8493A–AVR–02/12
XMEGA C4
9 System Clock and Clock options ......................................................... 18
9.1Features ..................................................................................................................18
9.2Overview .................................................................................................................18
9.3Clock Sources .........................................................................................................19
10 Power Management and Sleep Modes ................................................. 21
10.1Features ................................................................................................................21
10.2Overview ...............................................................................................................21
10.3Sleep Modes .........................................................................................................21
11 System Control and Reset .................................................................... 23
11.1Features ................................................................................................................23
11.2Overview ...............................................................................................................23
11.3Reset Sequence ....................................................................................................23
11.4Reset Sources .......................................................................................................24
12 WDT – Watchdog Timer ......................................................................... 25
12.1Features ................................................................................................................25
12.2Overview ...............................................................................................................25
13 Interrupts and Programmable Multilevel Interrupt Controller ........... 26
13.1Features ................................................................................................................26
13.2Overview ...............................................................................................................26
13.3Interrupt vectors ....................................................................................................26
14 I/O Ports .................................................................................................. 28
14.1Features ................................................................................................................28
14.2Overview ...............................................................................................................28
14.3Output Driver .........................................................................................................29
14.4Input sensing .........................................................................................................31
14.5Alternate Port Functions ........................................................................................31
15 TC0/1 – 16-bit Timer/Counter Type 0 and 1 ......................................... 32
15.1Features ................................................................................................................32
15.2Overview ...............................................................................................................32
16 TC2 – Timer/Counter Type 2 ................................................................. 34
16.1Features ................................................................................................................34
16.2Overview ...............................................................................................................34
17 AWeX – Advanced Waveform Extension ............................................. 35