K28F COLORBURST

[javierhernande1]

Hello,

I', using a Video Sync Separator with the K28F to get the luminance to text/graphic overlay, connecting it to the analog comparator module.

Also, I would to get the chrominance, in order to change the color text/graphics. I have seen that with a microcontroller it's possible using a crystal oscillator of 14.3181 MHz. I'm using a external 32.768Khz crystal in my project.

I could to use someone the internal clocks of the K28F to it? or I will need to add a external crystal?

Best regards

Arduino TVoutColor NTSC - YouTube 

[miduo]

Hi,

I am not quite sure if I understand you correctly. If not, please correct me.

For your application, I do think an internal clock can been used without problems. From the manual, you can see below:

So both OSCERCLK and IRC48MCLK internal clock can been used as adc module.

[javierhernande1]

Hello Fang Li,

Thanks for the reply,

I'm reading this but I haven't finished yet.

You want to say that I can adjust OSCERCLK or IRC48MCLK to 14.3181 Mhz via software?

Best regards

[miduo]

Hi, Javier

yes, you can config an external clock for ADC by select ALTCLK (ADCx_CFG1[ADICLK] = 10) and input an external clock to EXTAL/XTAL pins. ALTCLK is connected to OSCERCLK.