AN979 Datasheet, PDF (11/14 Pages) STMicroelectronics – DRIVING AN ANALOG KEYBOARD WITH THE ST7 ADC

DRIVING AN ANALOG KEYBOARD WITH THE ST7 ADC
Figure 8. Flowchart: key process
key_process
yes
X = FF ?
no
X = Preval? ^yes
no
LED glows
Preval = X
return
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