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TRK-USB-MPC5643L VCP maximum bit rate?

Question asked by Bruce McKenney on Apr 29, 2016
Latest reply on May 2, 2016 by Bruce McKenney

I am using the TRK-USB-MPC5643L UART (LINFlexD_0) via the USB virtual COM port.

 

It runs perfectly up to 500kbps[BRR=8]. However, when I speed it up past this (571429[BRR=7], 666667[BRR=6], or 800000[BRR=5]), I get garbage characters as though the bit rate is wrong.

 

This affects both Rx and Tx, and the bytes are wrong one-for-one and consistently (always the same wrong value), so it doesn't appear to be very far off.

 

I'm using putty at my host; over the years I've found putty quite reliable even when using unusual bit rates. I've certainly had no difficulties with bit rates up to 1Mbps.

 

Is it possible that I'm going too fast for the passthrough logic in the MC9S08? What is the maximum bit rate I can use in the VCP?

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