RM0016 Clock control (CLK)
Doc ID 14587 Rev 8 77/449
9 Clock control (CLK)
The clock controller is designed to be powerful, very robust, and at the same time easy to
use. Its purpose is to allow you to obtain the best performance in your application while at
the same time get the full benefit of all the microcontroller’s power saving capabilities.
You can manage all the different clock sources independently and distribute them to the
CPU and to the various peripherals. Prescalers are available for the master and CPU clocks.
A safe and glitch-free switch mechanism allows you to switch the master clock on the fly
from one clock source to another one.
EMC-hardened clock configuration registers
To protect the application against spurious write access or system hang-up, possibly caused
by electromagnetic disturbance, the most critical CLK registers are implemented as two
bitfields that must contain complementary values. Mismatches are automatically detected
by the CLK, triggering an EMC reset and allowing the application to cleanly recover normal
operations. See CLK register description for more details.
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