±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
HOST-INITIATED DEBOUNCE SCAN
KEY-PRESS-INITIATED DEBOUNCE SCAN
KEYPAD
TOUCH
KEYPAD
TOUCH
YES
ARE THERE
UNREAD DEBOUNCE
RESULTS?
YES
ARE THERE
UNREAD DEBOUNCE
RESULTS?
NO
SET
KEYIRQ LOW
NO
SET
KEYIRQ LOW
IS KEYSTS1 = 1?
YES
GO TO KEY-PRESS-INITIATED
DEBOUNCE SCAN
IS KEYSTS1 = 1?
YES
NO
GO TO HOST-INITIATED
DEBOUNCE SCAN
NO
HOST WRITES
ADC
CONTROL REGISTER
START CLOCK
START CLOCK
SET BUSY LOW
SET BUSY LOW
SCAN AND DEBOUNCE KEYS
SCAN AND DEBOUNCE KEYS
STORE KEYPAD SCAN
RESULTS IN REGISTER
STORE KEYPAD SCAN
RESULTS IN REGISTER
SET BUSY HIGH
SET BUSY HIGH
RESET KEYIRQ HIGH
RESET KEYIRQ HIGH
DONE
DONE
Figure 25. Key-Press-Initiated Debounce Scan
Figure 26. Host-Initiated Debounce Scan
40
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