8-bit MicrocontrollersのトピックRe: Minimum Amplitude of the External Clock Input https://community.nxp.com/t5/8-bit-Microcontrollers/Minimum-Amplitude-of-the-External-Clock-Input/m-p/1038152#M23077 <HTML><HEAD></HEAD><BODY><P><SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>Hi Jiunn,</SPAN></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>You can find these&nbsp;</SPAN>parameters in the table: DC characteristics in S08PB/S08SU datasheet.</SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/103163iE4CD592BEC25ED97/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;">As shown in the above table, the <SPAN>minimum amplitude of&nbsp;<SPAN style="background-color: #ffffff;">external clock input</SPAN>&nbsp;can be calculated by the marked formula.</SPAN></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>1. The voltage: Vddx = 5V,&nbsp; the&nbsp;<SPAN style="background-color: #ffffff;">minimum&nbsp;</SPAN>high voltage of the pin: 0.70 x 5v = 3.5V,&nbsp; &nbsp;3.3V OSC is not OK.</SPAN></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>2. The 3.3V OSC is ok only if Vddx &lt;=4.7V.</SPAN></SPAN></P><P></P><P>Thanks&nbsp;</P></BODY></HTML> Tue, 03 Mar 2020 08:30:45 GMT xuan_wu 2020-03-03T08:30:45Z Minimum Amplitude of the External Clock Input https://community.nxp.com/t5/8-bit-Microcontrollers/Minimum-Amplitude-of-the-External-Clock-Input/m-p/1038151#M23076 <HTML><HEAD></HEAD><BODY><P>As we know the PB is 5V system MCU, and the SU is also high operating voltage(4.5~18v).</P><P></P><P>How minimum amplitude of the external clock input for the MC9S08PB8VTG and <SPAN>MC9</SPAN>S08SU8?</P><P>is there okay for 3.3v OSC?</P><P></P><P>I can not find these parameters in Datasheet.</P><P></P><P>Thanks!</P></BODY></HTML> Tue, 03 Mar 2020 03:07:46 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Minimum-Amplitude-of-the-External-Clock-Input/m-p/1038151#M23076 jiunnyang 2020-03-03T03:07:46Z Re: Minimum Amplitude of the External Clock Input https://community.nxp.com/t5/8-bit-Microcontrollers/Minimum-Amplitude-of-the-External-Clock-Input/m-p/1038152#M23077 <HTML><HEAD></HEAD><BODY><P><SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>Hi Jiunn,</SPAN></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>You can find these&nbsp;</SPAN>parameters in the table: DC characteristics in S08PB/S08SU datasheet.</SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/103163iE4CD592BEC25ED97/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;">As shown in the above table, the <SPAN>minimum amplitude of&nbsp;<SPAN style="background-color: #ffffff;">external clock input</SPAN>&nbsp;can be calculated by the marked formula.</SPAN></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>1. The voltage: Vddx = 5V,&nbsp; the&nbsp;<SPAN style="background-color: #ffffff;">minimum&nbsp;</SPAN>high voltage of the pin: 0.70 x 5v = 3.5V,&nbsp; &nbsp;3.3V OSC is not OK.</SPAN></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>2. The 3.3V OSC is ok only if Vddx &lt;=4.7V.</SPAN></SPAN></P><P></P><P>Thanks&nbsp;</P></BODY></HTML> Tue, 03 Mar 2020 08:30:45 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Minimum-Amplitude-of-the-External-Clock-Input/m-p/1038152#M23077 xuan_wu 2020-03-03T08:30:45Z