EKTF6708 datasheet(109/158 Pages) EMC

109 / 158 page

eKTF6708

8-Bit Microcontroller

IC Product Specification (V1.2) 03.12.2020

 99

(This specification is subject to change without prior notice)

6.8.5 PWM Duty Cycle (DTX: DTxH/DT1L)

The PWM duty cycle is defined by writing to the DTX register, and is latched from DTX to

DLX while TMRX is cleared. When DLX is equal to TMRX, the PWMX pin is cleared. DTX

can be loaded at anytime, however it cannot be latched into DLX until the current value of

DLX is equal to TMRX.

The following formula shows how to calculate the PWM duty cycle:









value

prescale

TMRX

DTX

cycle

Duty

OSC



















Example:

DTX = 10;

Fosc = 4 MHz;

TMRX (0, 0, 0) = 1 : 1;

Then

 

cycle

Duty























6.8.6 PWM Programming Process/Steps

Load the PWM duty cycle to DT

Load the PWM time period to PRD

Enable the interrupt function by writing Bank0-R1D, if required

Load a desired value for the timer prescaler

Enable PWMX function (i.e., enable PWMXE control bit)

Finally, enable TMRX function (i.e., enable TXEN control bit)

If the application needs to change PWM duty and period cycle at run time, refer to the

following programming steps:

Load new duty cycle (if using dual PWM function) at any time.

Load new period cycle. You must take note of the order of loading period cycle. As the

low byte of PWM period cycle is assigned a value, the new PWM cycle is loaded into a

circuit.

The circuit will automatically update the new duty and period cycles to generate new

PWM waveform at the next PWM cycle.

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