Description: The end of the keyboard scanning, registers the value of R1 expressed on the direct button is pressed that, based on different keys to perform different procedures in order to achieve a 16 keyboard matrix scanning, the same principle can be identified up to 255 keys scanning the matrix. We can be the beginning of each keyboard scan to check whether the value of R0 to 0, only for the 0 to scan the keyboard, not just to 0 on the proven key scanned, the corresponding button has not yet completed the work. However, it must be remembered that the implementation of each key command is completed, give R0 write 0, that can scan the keyboard.
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