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Is it possible to design with MSP430F5528+TRF7970A for supporting all NFClink function???

Other Parts Discussed in Thread: MSP430F5529, TRF7970A, MSP430F5528

Dear TI's...

I've test with MSP-EXP430 EVM (MSP430F5529) + TRF7970A using NFClink for Reader/Writer, P2P, CE function
and it works well. But in our product real design, we think MSP430F5529 IC package size is too large and
want to replace with MSP430F5528(small package 64P/YFF)+TRF7970A to support all functions of NFClink.

Is this possible? If migrating FW code from MSP430F5529 to MPS430F5528, FW code need to be modify?
Or can directly use?

Another question is that:

MSP430F5529(or)MSP430F5528 use two external crystals (32.768kHz for RTC & 4MHz for MCU system clock).
Is this possible to replace 4MHz crystal source with clock feedback from TRF7970A?

If anyone know these two questions, please give us some suggestion for urgent design for our product, thanks!!!
Brs...

Johnathan, Chen.