Facebook
Google
GitHub
Linkedin
Hi there.
I am building an Ultrasonic range finder which runs at 40kHz. I have it running from a waveform Generator at present however I want to switch this to PWM from the Micro (AT89C51AC3).
I have code that sets up the PWM, and gets it running at 4kHz, however I do not know how I can increase this to 40kHz.
void MyInitPwm(){
CR = 1; //Turn on the PCA Timer/Counter
CCAPM0 = 0b01000010; //Enable PWM, Enable Compare
CCAP0H = 0x7F; // Sets Capture
CMOD = (CMOD | 0b00000011) & 0b11111011; // Enable PCA counter overflow and set to use internal clock/2
}
Any ideas?
I am building an Ultrasonic range finder which runs at 40kHz. I have it running from a waveform Generator at present however I want to switch this to PWM from the Micro (AT89C51AC3).
I have code that sets up the PWM, and gets it running at 4kHz, however I do not know how I can increase this to 40kHz.
void MyInitPwm(){
CR = 1; //Turn on the PCA Timer/Counter
CCAPM0 = 0b01000010; //Enable PWM, Enable Compare
CCAP0H = 0x7F; // Sets Capture
CMOD = (CMOD | 0b00000011) & 0b11111011; // Enable PCA counter overflow and set to use internal clock/2
}
Any ideas?
