L6460 datasheet(90/139 Pages) STMICROELECTRONICS

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General purpose PWM

L6460

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Doc ID 17713 Rev 1

General purpose PWM

L6460 includes three general purpose PWM generators that can be redirected on GPIO

pins (see Chapter 22). Two of these generators (Aux_PWM_1 and Aux_PWM_2) work with

a fixed period FOSC/512 and have a programmable duty cycle; the other one (GP_PWM)

has a programmable base time clock and a programmable time for both high and low levels.

19.1

General purpose PWM generators 1 and 2 (AuxPwm1 and

AuxPwm2)

The Duty cycle of these PWM generators can be changed by writing the AuxPwmXCtrl bits

(where X can be 1 or 2) in the AuxPwm1Ctrl and AuxPwm2Ctrl registers. Their positive duty

cycle will change according to the equation:

According to this equation a programmed “0” value will cause a 0% duty cycle (output

always at logic level 0).

19.2

Programmable PWM generator (GpPwm)

GpPWM has a programmable base clock that can be changed by programming the

GpPwmBase[6:0] bits in the GpPwmBase register. The clock will change according to the

equation:

The high and low level duration (expressed in base clock periods), can be programmed

writing the GpPwmHigh[7:0] and GpPwmLow[7:0] bits in the GpPwmCtrl register so they will

change according to following equations:

The resulting period of the PWM will be:

and the positive duty cycle will result:

A programmed value of 0 in GpPwmHigh[7:0] and GpPwmLow[7:0] bits will force the PWM

generator output to be always at logic level “0”.

PWM_X_DUTY

AuxPwmXCtrl 9:0

[]/512

PWM_BASE_PERIOD

GpPwmBase 6:0

[] 1

() Tosc

High_level_Time

GpPwmHigh 7:0

[] PWM_BASE_PERIOD

Low_level_Time

GpPwmLow 7:0

[] PWM_BASE_PERIOD

Period

GpPwmHigh 7:0

[] GpPwmLow 7:0

[]

() PWM_BASE_PERIOD

DutyCycle

High_level_Time

Low_level_Time

-----------------------------------------------------------------------------------------------

GpPwmHigh 7:0

[]

GpPwmHigh 7:0

[] GpPwmLow 7:0

[]

---------------------------------------------------------------------------------------------------------

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