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Discussion Groups | M68HC11 | can I boot an hc11e2 at 7200 buad using a 7.3728 xtal?
Technical discussions about Freescale Microcontrollers: M68HC11. (Freescale Semiconductor is a Subsidiary of Motorola).
can I boot an hc11e2 at 7200 buad using a 7.3728 xtal? - Bob Gardner - Feb 25 13:55:00 2005
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I changed the xtal from 8 to 7.3728 on an hc11e2 bd I had... that should change the boot baud rate from 7812 (8mhz) to 7200 (7.3728mhz) if the 1st byte if the boot image is $FF. I wrote a little console app to init com1 to 7200 and send my little binary ledflasher program to the hc11. The end of the binary bootable file is padded out to 257 bytes... the FF plus 256 bytes.... seems like this should work... havent got it to work yet.. must be overlooking something... ideas? I guess if this worked, someone would have done it 15 years ago.... |
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