Datasheet

78
XMEGA B [DATASHEET]
8291B–AVR–01/2013
Figure 7-1. The clock system, clock sources, and clock distribution.
Real Time
Counter
Peripherals RAM AVR CPU
Non-Volatile
Memory
Watchdog
Timer
Brown-out
Detector
System Clock Prescalers
USB
Prescaler
System Clock Multiplexer
(SCLKSEL)
PLLSRC
DIV32
32 kHz
Int. ULP
32.768 kHz
Int. OSC
32.768 kHz
TOSC
2MHz
Int. Osc
32 MHz
Int. Osc
0.4 – 16 MHz
XTAL
DIV32
DIV32
DIV4
PLL
USBSRC
TOSC1
TOSC2
X
TAL1
XTAL2
clk
SYS
clk
RTC
clk
PER2
clk
PER
clk
CPU
clk
PER4
clk
USB
LCD
clk
LCD
PC[7:0]
XOSCSEL
RTCSRC