David Perry

Programming HC908QT4 via serial port with Prog08SZ

Discussion created by David Perry on Mar 18, 2008
Latest reply on Mar 31, 2008 by Zahar Raskin
I have the Frescale demo board for the 908, which will program the device that came with the board with no problems.
I now have some blank devices but can't get any communications with them at all.
I have tried a 9.8MHz clock, /IRQ at 0V, 5V and 9V, PTA1 at 5V and PTA4 at 0V. I only get loopback at best.
The original device works fine with 9.8MHz and /IRQ at 9V. (modified the demo board for this, removing doesn't help).

Anyone any ideas?