Single-chip test board circuit 5

Published:2011/7/24 22:30:00 Author:Ecco | Keyword: Single-chip , test board | From:SeekIC

Jumper JMPO's role: it is used for the digital test unit and water light testing unit conversion, when it is short connected at the location of 12, the water light unit is effective; when it is short connected in the 23 position, the digital control unit is effective. Jumper JMP1's role: it is used to control the output enable of 74LS244 driver, when it is short connected in position 12, the enable is in the default location of the experimental board; when it is short connected at 23 position, all the output of the 74LS244 is in the low level, and it is no longer controlled by the microcontroller output.



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