ColdFire/68K Microcontrollers and Processors中的主题 MCF52210 ADC Question https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF52210-ADC-Question/m-p/148750#M3653 <HTML><HEAD></HEAD><BODY><DIV>Hi, I just have a question.<BR />Is it possible to configure the ADC clock to 5Khz?<BR />I'm using the PLL with frequency at 64MHz and datasheet says that the minimum frequency is 500Khz.</DIV><DIV>&nbsp;</DIV><DIV>thanks!</DIV></BODY></HTML> Sat, 24 Oct 2009 01:18:50 GMT Cuozzo 2009-10-24T01:18:50Z MCF52210 ADC Question https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF52210-ADC-Question/m-p/148750#M3653 <HTML><HEAD></HEAD><BODY><DIV>Hi, I just have a question.<BR />Is it possible to configure the ADC clock to 5Khz?<BR />I'm using the PLL with frequency at 64MHz and datasheet says that the minimum frequency is 500Khz.</DIV><DIV>&nbsp;</DIV><DIV>thanks!</DIV></BODY></HTML> Sat, 24 Oct 2009 01:18:50 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF52210-ADC-Question/m-p/148750#M3653 Cuozzo 2009-10-24T01:18:50Z Re: MCF52210 ADC Question https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF52210-ADC-Question/m-p/148751#M3654 <HTML><HEAD></HEAD><BODY><P>Hi</P><P>&nbsp;</P><P>The data sheet specifies that the ADC clock should be between 100kHz and 5MHz. This means that 5kHz would be outside of the specified operating range.</P><P>&nbsp;</P><P>Furthermore, the ADC clock is generated from the system clock by dividing it down using the DIV value in the (ADC) CTRL2 register. The maximum DIV value is 0x1f - giving a divide of 64 ((DIV + 1)*2). If your system clock is 32MHz (64MHz PLL) then the lowest ADC speed that you can select is 500kHz - to run the ADC slower than that it would be necessary to also run the processor (PLL) slower.</P><P>&nbsp;</P><P>Regards</P><P>&nbsp;</P><P>Mark</P><P>&nbsp;</P><P><A href="http://www.uTasker.com" rel="nofollow" target="_self">www.uTasker.com</A><BR />- OS, TCP/IP stack, USB, device drivers and simulator for M521X, M521XX, M5221X, M5222X, M5223X, M5225X. One package does them all - "<EM>Embedding it better...</EM>"</P><P>&nbsp;</P></BODY></HTML> Sat, 24 Oct 2009 23:48:49 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF52210-ADC-Question/m-p/148751#M3654 mjbcswitzerland 2009-10-24T23:48:49Z