A variable 8 bit Binary up down output

Edward Weiss

I am trying to use a 74ACT11867 or equivalent serial 8 bit up/down BCD counter , to get a variable BCD output . My clock input would vary from 1Hz thru 1kHz. I think I know how control the up & down, it's just the 0-255 BCD output.

Thank You

Ed Weiss

over 13 years ago

0 Chris Cockrill over 13 years ago

TI__Mastermind 46480 points

LL clears counter HL will load the data on A through H into the counter and it will begin to count from there up or down, whicher is selected.

0 Edward Weiss over 13 years ago in reply to Chris Cockrill

Prodigy 20 points

Thank You. Do I need to have the data inputs all high to have a Binary output?

0 Chris Cockrill over 13 years ago in reply to Edward Weiss

TI__Mastermind 46480 points

The data inputs dont matter except when you load the start number. When S1 is high and S0 is low it will load the data into the counter and that is wher it will start counting. If S1 and S0 are in any other state the data pins are ignored.

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A variable 8 bit Binary up down output