Information

5.7.1 PMC 1-kHz LPO clock
The Power Management Controller (PMC) generates a 1-kHz clock that is enabled in all
modes of operation, including all low power modes except VLLS0. This 1-kHz source is
commonly referred to as LPO clock or 1-kHz LPO clock.
5.7.2 WDOG clocking
The WDOG may be clocked from two clock sources as shown in the following figure.
WDOG_STCTRLH[CLKSRC]
WDOG clock
Bus clock
LPO
Figure 5-2. WDOG clock generation
5.7.3 Debug trace clock
The debug trace clock source can be clocked as shown in the following figure.
SIM_SOPT2[TRACECLKSEL]
TRACECLKIN
Core / system clock
MCGOUTCLK
TPIU
÷2
TRACE_CLKOUT
Figure 5-3. Trace clock generation
Module clocks
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
148 Freescale Semiconductor, Inc.