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Why data had changed in a SPI interface ?

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problem with spi

when i measure data(miso , mosi) and clock of spi interface with oscilloscope. i found that data was changed. have anyone know the cause of this problem. must i connect pull up resistor. i use rabbit3000. please help me.
 

problem with spi

Hi,

Never used it. But, SPI needs pull up ( most of the time ). HAve a look at the data sheet of the rabbit3000 and see if there is a circuit diagram. See if its noted there for pull up resistors.
Good luck.
 
Re: problem with spi

hi
first check u r wire length between host and peripheral device. if length is too large try to reduce it. if u r not want to reduce the length then try osther thing is that use one wire of data signal and one gnd wire which will reduce the effect of spi.but all gnd wire are not connected. only one of them is connnected to gnd.
 
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