When a key is pressed, a debounce logic comes into operation in
A. scanned keyboard special error mode
B. scanned keyboard with N-key rollover
C. scanned keyboard mode with 2 key lockout
D. sensor matrix mode
Answer:A
When a key is pressed, a debounce logic comes into operation in
A. scanned keyboard special error mode B. scanned keyboard with N-key rollover C. scanned keyboard mode with 2 key lockout D. sensor matrix mode
Explanation: In scanned keyboard mode with 2 key lockout mode of operation, when a key is pressed, a debounce logic comes into operation. During the next two scans, other keys are checked for closure and if no other key is pressed then the first pressed key is identified.