AN3404

Clock management

Doc ID 018847 Rev 3

9/30

Slowing down the clock decreases the immediate consumption but, often this is not the ideal

solution. By slowing down the clock, the CPU performance is also reduced and a longer

time is required to perform an action or computation. If we consider the average

consumption, it might be better to use the highest available clock speed to perform the

required operation, and then force the MCU into one of the low power modes (like Active-

halt mode) for the remaining time frame. This should be taken into account during the

design of application flowcharts.