ADuC7029 I2C bootloader

--- Background:

My project needs a bootloader using I2C interface to implement online upgrade. We do not allow using a hardware pin to  switch bootloader and application!!!

That is we do not allow switching bootloader and application by controlling BM pin high or low!!!

As we know that a I2C bootloader is built in ADuC702xi serials. 

I used ADuC7023i before. About switching bootloader and application, the datasheet of ADuC7023i describes like this:

"Boot Mode Entry Pin. The ADuC7023 enters I2C download mode if BM is
low at reset with a flash address 0x80014 = 0xFFFFFFFFF. The ADuC7023
executes code if BM is pulled high at reset or if BM is low at reset with a
flash address 0x80014 not equal to 0xFFFFFFFFF"

So I can switch bootloader and application by changing the value of flash address 0x80014 and pull BM pin low at the meanwhile.

--- Problem:

Now for the new project we will use ADuC7029i, I read the datasheet and found that the description about  switching bootloader and application was not the same with ADuC7023i:

"The ADuC7029 enters UART download mode if BM is low
at reset and executes code if BM is pulled high at reset through a 1 kΩ resistor"

I have no idea whether ADuC7029i can use the value of flash address 0x80014 to switch bootloader and application or not!!!



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[edited by: luopeng45 at 2:39 AM (GMT 0) on 10 Apr 2020]
  • 0
    •  Analog Employees 
    on Apr 14, 2020 11:42 AM 7 months ago

    Hi,

    The ADuC7029i and ADuC7023 have the exact same download mode entry sequence.

    There are 2x variants of the ADuC7029. One comes with a UART download (not what you want) - the other comes with the I2C downloader - this is the "i" version and the one you want.

    Generic order number for the generic you need is : ADUC7029BBCZ62I

    Regards,

    Mikel