msp430 PWM period calculation

fish001

msp430 PWM period calculation [Copy link]

Example: P4DIR |= BIT1+BIT2+BIT3; // P4.1 - P4.3 output P4SEL |= BIT1+BIT2+BIT3; // P4.1 - P4.3 TBx options TBCCR0 = 512-1; // PWM Period TBCCTL1 = OUTMOD_7; // CCR1 reset/set TBCCR1 = LightCDPM; // CCR1 PWM duty cycle TBCCTL2 = OUTMOD_7; In the up-counting mode, CCR0 is used for period timing and CCR1 for PWM duty cycle adjustment. TA1 -> PWM output: 512 (that is, CCR0 value) X timer count clock = PWM period 128 (if it is CCR1 value) X timer count clock = PWM duty cycle Actually it is 512 clock cycles. Assuming that your timer B uses 8M clock, the actual PWM period = 512/8M = 64us

chenbingjy

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tiankai001

Very useful, thanks for sharing