Description: Design uses a scanning keyboard interface port P3, P1.0 port as output, P1 port access 4X4 low 4 matrix keyboard out, the high four connected lines. CPU operating mode and open the query interrupt, and set the timer T1 the highest priority. When the scan delay to the call button again after the scan and determine the anti-shake key, and transferred to the corresponding key processing subroutine, the subroutine is loaded to the timer and start the initial work, when the timer overflows apply to the CPU interrupt, CPU interrupt to the interrupt subroutine, after the output frequency to and intended to amplify the audio amplifier module output.
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Keyboard
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........\Last Loaded dzq.DBK
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