Description: AT89S51 using the parallel port P1 then 4 × 4 matrix keyboard to P1.0-P1.3 as input lines to P1.4-P1.7 for output line in digital tube display each key of
To Search:
- [74LS164] - 74LS164 serial port driver serial port d
- [2688] - POJ on the 2688 title more than one solu
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