topic Re: Using 08jm processor and usb with uarts in 8-bit Microcontrollers https://community.nxp.com/t5/8-bit-Microcontrollers/Using-08jm-processor-and-usb-with-uarts/m-p/213432#M18401 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>&nbsp;</P><P>My understanding is that, for USB operation, a bus clock of 24 MHz is required, generated using PEE mode.&nbsp; You do not mention the SCI baud rate that you require, but it should be possible to generate a range of standard baud rates with this high bus frequency.&nbsp; For example, a baud divisor of 13 would generate 115,200 bit per second, and a baud rate divisor of 78 would generate 19,200 bit per second.</P><P>&nbsp;</P><P>Regards,</P><P>Mac</P></BODY></HTML> Wed, 02 Sep 2009 21:14:26 GMT bigmac 2009-09-02T21:14:26Z Using 08jm processor and usb with uarts https://community.nxp.com/t5/8-bit-Microcontrollers/Using-08jm-processor-and-usb-with-uarts/m-p/213431#M18400 <HTML><HEAD></HEAD><BODY><P>thanks in advance for your thoughts&nbsp;</P><P>&nbsp;</P><P>11.0592 for the uarts or the specified multiple oe 2mhz &nbsp;for the usb which would take me to 12mhz...</P><P>so then my question is what xtal ( crystal ) do i use.... 11.0592 &nbsp;or 12mhz...</P><P>i have a problem that im going to use the usb port for boot loading and gtghe uarts for rs232 comms</P><P>Hi all</P></BODY></HTML> Wed, 02 Sep 2009 09:48:01 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Using-08jm-processor-and-usb-with-uarts/m-p/213431#M18400 Danzo 2009-09-02T09:48:01Z Re: Using 08jm processor and usb with uarts https://community.nxp.com/t5/8-bit-Microcontrollers/Using-08jm-processor-and-usb-with-uarts/m-p/213432#M18401 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>&nbsp;</P><P>My understanding is that, for USB operation, a bus clock of 24 MHz is required, generated using PEE mode.&nbsp; You do not mention the SCI baud rate that you require, but it should be possible to generate a range of standard baud rates with this high bus frequency.&nbsp; For example, a baud divisor of 13 would generate 115,200 bit per second, and a baud rate divisor of 78 would generate 19,200 bit per second.</P><P>&nbsp;</P><P>Regards,</P><P>Mac</P></BODY></HTML> Wed, 02 Sep 2009 21:14:26 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Using-08jm-processor-and-usb-with-uarts/m-p/213432#M18401 bigmac 2009-09-02T21:14:26Z