Freescale Semiconductor MPC5604B - Functional Description

MPC5604B/C Microcontroller Reference Manual, Rev. 8
112 Freescale Semiconductor
Figure 6-11. Clock Monitor Unit diagram
6.8.4 Functional description
The clock and frequency names referenced in this block are defined as follows:
• FXOSC_clk: clock coming from the fast external crystal oscillator
CMU_MDR
XOSC Supervisor
FXOSC < FIRC / n
CMU_HFREFR
CMU_LFREFR
Frequency Meter
CMU_FDR
FMPLL Supervisor
OLR_evt
FHH_FLL_OR_evt_a
XXOSC ON/OFF
From MC_ME
FMPLL ON/OFF
From MC_ME
MUX1
CKSEL1[1:0]
00
01
10
11
FIRC_clk
FIRC_clk
SIRC_clk
SXOSC_clk
FXOSC_clk
FMPLL
FMPLL > hfref
OR
FMPLL < lfref
OLR_evt : It is the event signalling XOSC failure when asserted. When this signal is asserted, RGM may generate reset, interrupt
or SAFE request based on the RGM configuration.
FHH_FLL_OR_evt_a : It is the event signalling FMPLL failure when asserted. Based on the CMU_HFREFR and CMU_LFREFR
configuration, if the FMPLL is greater than hign frequency range or less than the low frequency range configuration, this signal is
generated. When this signal is asserted, RGM may generate reset, interrupt or SAFE request based on the RGM configuration.