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Field BCDU
writer - BCD update
1s increment each time SS[7:0]=0
1s increment each time SS[8:0]=0
1s increment each time SS[9:0]=0
1s increment each time SS[10:0]=0
1s increment each time SS[11:0]=0
1s increment each time SS[12:0]=0
1s increment each time SS[13:0]=0
1s increment each time SS[14:0]=0