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Serial data on Oscilloscope

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O

OvErFlO

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I have watch my serial data on my oscilloscope but I have see that, when I press more of one time the same button the 7th bit of data change,Why ???

|start|0|1|2|3|4|5|6|7|stop|

0 1 0 1 1 0 0 0 0 1
0 1 0 1 1 0 0 0 1 1
0 1 0 1 1 0 0 0 0 1
0 1 0 1 1 0 0 0 1 1

Thanks
 

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