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ST7540 spi communication problem

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bakiyarajembed

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hi,
I am trying to interface ST7540 with SPI, I am able to write data in the control register.
When im trying to send some data to mains I could not receive anything in the another ST7540 modem.
when I am monitoring CDPD which by default giving square wave even when there is no data transaction.
st7540 spitting out clock pulses when there is no data transaction.
Thanks for your time.
Thanks
rAj
 

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