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LCD Refresh pin with PWM?


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I'm looking to refresh the LCD in our project at 30-90Hz.  I have found the included code online, but don't understand how the signal is being tied to the output pins.  I have a lot of pins set to output already, and need the PWM signal to only be present on one.  Oh, and because of intense power restrictions, I am using the VLO for my timer interrupts and will need to use it for the PWM signal as well.

 

NOTE: the PWM mode that toggles from high to -high will need to be used, instead of high to ground.

Thanks guys!

 

#include "msp430x21x2.h"

void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P1DIR |= 0x0C; // P1.2 and P1.3 output
P1SEL |= 0x0C; // P1.2 and P1.3 TA1/2 otions
TA0CCR0 = 512 - 1; // PWM Period
TA0CCTL1 = OUTMOD_7; // TA0CCR1 reset/set
TA0CCR1 = 384; // TA0CCR1 PWM duty cycle
TA0CCTL2 = OUTMOD_7; // TA0CCR2 reset/set
TA0CCR2 = 128; // TA0CCR2 PWM duty cycle
TA0CTL = TASSEL_2 + MC_1; // SMCLK, up mode

__bis_SR_register(CPUOFF); // Enter LPM0
}

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