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Chapter 7 Clock Generation Module (MC_CGM)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
143
7.6.1.1
System Clock Source Selection
During normal operation, the system clock selection is controlled:
•
On a SAFE mode or reset event, by the MC_RGM
•
Otherwise, by the MC_ME
7.6.1.2
System Clock Disable
During normal operation, the system clock can be disabled by the MC_ME.
7.6.1.3
System Clock Dividers
The MC_CGM generates three derived clocks from the system clock.
7.6.1.4
Dividers Functional Description
Dividers are utilized for the generation of divided system and peripheral clocks. The MC_CGM has the
following control registers for built-in dividers:
•
Section 7.5.3.1, System Clock Divider Configuration Registers (CGM_SC_DC0…2)
The reset value of all counters is 1. If a divider has its DE bit in the respective configuration register set to
0 (the divider is disabled), any value in its DIVn field is ignored.
7.6.2
Output Clock Multiplexing
The MC_CGM contains a multiplexing function for a number of clock sources that can then be utilized as
output clock sources. The selection is done via the CGM_OCDS_SC register.
Figure 7-8. MC_CGM Output Clock Multiplexer and PA[0] Generation
CGM_OCDS_SC.SELCTL
CGM_OCDS_SC.SELDIV
0
1
2
3
Register
Register
4-16 MHz ext. xtal osc.
0
16 MHz int. RC osc.
1
freq. mod. PLL
2
system clock
3
RTC clock
4
PA[0]
0
CGM_OC_EN Register
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