key Scan button 82,798,279 plus 51 single-chip dec

Title: key

Category:
SCM
Tags:
[C/C++] [源码]
File Size:
2.09kb
Update:
2008-10-13
Downloads:
0 Times
Uploaded by:
qqmhappy

Description: Scan button 82,798,279 plus 51 single-chip decoder 74LS 138 through the expansion of 4 × 4 keyboard, the display 6. From 3-8 decoder SL0 ~ SL2 translated to the key scanning line, by another 3-8 decoder translated display scan line, and uses code scanning. In order to prevent the emergence of the phenomenon of re-key, scan the output line does not take part in high level SL3 scan decoding keys. CPU on the 8279 surveillance using the query mode, the 8279 interrupt request signal IRQ left unused.

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