參數(shù)資料
型號: L6460TR
廠商: STMICROELECTRONICS
元件分類: 運動控制電子
英文描述: STEPPER MOTOR CONTROLLER, PQFP64
封裝: 10 X 10 MM, 1 MM HEIGHT, ROHS COMPLIANT, TQFP-64
文件頁數(shù): 130/139頁
文件大?。?/td> 3837K
代理商: L6460TR
General purpose PWM
L6460
90/139
Doc ID 17713 Rev 1
19
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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