PXD20RM Datasheet, PDF (251/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

IRCOSC_CLK
16 MHz
FXOSC_CLK
4–16 M
FMPLL_0
64 MHz
CK 0 (reference)
CK FXOSC _CMU
CK PLL
OLR
FLL
FXOSC valid (on AND stable)/off
FMPLL_0 valid (on AND locked)/off
MC_CGM
Loss of crystal
FMPLL_0 freq.
out of range
FCU
Figure 8-35. CMU component interaction
8.7.2 Main features
• RC oscillator frequency measurement
• External oscillator clock monitoring with respect to CK_FIRC/n clock
• PLL clock frequency monitoring with respect to CK_FIRC/4 clock
• Event generation for various failures detected inside monitoring unit
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
8-55