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ST72251 Datasheet(PDF) 5 Page - STMicroelectronics

Part # ST72251
Description  ST7 KEYPAD DECODING TECHNIQUES, IMPLEMENTING WAKE-UP ON KEYSTROKE
PDF  10 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72251 Datasheet(HTML) 5 Page - STMicroelectronics

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FLOWCHARTS
5 FLOWCHARTS
Figure 2. Flowchart: Main program
Figure 3. Flowchart: external interrupt (EI1)
Initializations
HALT
infinite
loop
X = 48 (3x16 coded values)
one column activated
yes
corresponding value of the pressed key
stored into A, X and sent on LEDS
EXIT
no
store into X
next column
Is there a low level on the
intersection of the stored
row and column?
value
(PA0...PA3)



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