I do the following steps:
1.) Voltage OFF
2.)Drive PA0,PA1,PA2, TST Pins HIGH (3,3V)
4.)TST = LOW; PA0,PA1,PA1 = unconnected
Now the SAM-BA Boot Mode must be enabled, but is isnÂ´t. The DBGU ist initialiszed. The DTXD Pin falls from 3,3V to 2,8V.(Not initialized as an Output).
There is no voltage on the PLL Filter...
On another Board Layout itÂ´s working??? but why???
Microcontroller = AT91SAM7S128
XTAL is standard 18,34 MHz...PLL Filter 1,5k, 1nF 10 nF...(Standard)
What could be the problem ?
Which Pins are ALWAYS necessary, which PINS are checked at the beginning of SAM-BA boot mode initialization...
please help, I DonÂ´t now how to go on...
Microchip in-system programming solution: SAM-BA
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