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need help:LPC11U68&RC663:Couldn't read back version register

Question asked by Dawei You Employee on Dec 8, 2016
Latest reply on Dec 21, 2016 by Dawei You

Hi:

 

I am studying the LPC11U68 + CLEV663B for reader library project(SW2978), but SPI couldn't read back RC663's version register(addr:0x7f), normally 0xff or 0x00.

 

I have read AN11211 carefully, the CLEV663B has configured to SPI communication, connect R34 resistor, give the power from USB port. And could watch SPI MOSI and SCK from oscillograph, but no MISO is watched.

 

So PLS help check, what problem maybe occur? thx.

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