How to force a Boot Mode selection for F28335.

Manuel Nieves

Hi TI guys,

GPIO pins 84, 85, 86, 87 can be set as a input, output or XA. Those foour pins allow selecting the boot ROM mode. If all of them are set to high value the boot jumps to flash (TMS320x2833x, 2823x Boot ROM SPRU963A). I have a question, what configuration (input, output, XA) do I have to set to select the boot mode? why those four pins (84 to 87) are named GPIO if thay can not be used as a input or output since their fuctions is to set the boot mode?

Best regards

over 10 years ago

0 Gautam Iyer over 10 years ago

Guru 192875 points

Hi Manuel,

I hope you've checked this table out:

Regards,

Gautam

0 Manuel Nieves over 10 years ago in reply to Gautam Iyer

Prodigy 240 points

Hi Gautam,

Yes, I have seen this table. I want to boot from flash so I will set the four pins high , but I am not clear about how set the GPIO: input, output or XA.

Best regards

0 Gautam Iyer over 10 years ago in reply to Manuel Nieves

Guru 192875 points

Leave them with default values ie input.

Regards,
Gautam

0 Manuel Nieves over 10 years ago in reply to Gautam Iyer

Prodigy 240 points

Ok, thanks. I have a doubt, could we use those pins as a normal input or output pin?

Regards

0 Gautam Iyer over 10 years ago in reply to Manuel Nieves

Guru 192875 points

Yes you can use any of the boot pins as either an input or output after the device has booted.

Regards,
Gautam

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How to force a Boot Mode selection for F28335.