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