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Trimming The HCS08SH8 ICS To Non-Standard Frequencies Using a P&E USB Multilink

Question asked by David Boyd on Jun 13, 2013
Latest reply on Jun 15, 2013 by bigmac

I've always used the default internal reference frequency trim values when using the ICS (31,250Hz) and ICG (243,000Hz) on HSC08 processors.  However I have a need to trim the ICS on a SH8 to a specific value (38,000) so that I can generate some accurate high frequency baud rates on the SCI.

 

The SH8 spec sheet says I can trim from 31,250 to 39,062.5Hz, so my value of 38,000 Hz is within range, to generate a bus clock of 19,450,000 and a baud rate of 64,000 with an SCI modulo divisor of 19.

 

I am using a P&E USB Multilink Interface.  P&E tell me that I can use the Multilink to generate customised TRIM values by using the PROGHCS08 software and specifying a specific bus frequency, however I have not been able to work out how to do this. Has anyone done this?

 

thanks for your help in advance

 

David

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