May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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278
INTERFACING: KEYBOARDS
5. Bouncing of any mechanical contact type key may
last for a maximum of
(a) 40 microseconds (b) 4 milliseconds
(c) 1/4th of a second (d) none of these
6. For hardware debouncing, the key with pull-up
resistor should be attached with
(a) another resistor (b) a capacitor
(c) a diode (d) none of these
7. For software debouncing, it is to be ensured that
the key is
(a) released
(b) sensed for more than 40 milliseconds
(c) sensed twice
(d) none of these
8. The maximum number of keys may be interfaced
with seven Port pins would be
(a) 7 (b) 10
(c) 12 (d) none of these
9. To read any two-dimensional keyboard matrix,
the output pins should output
(a) one 0 and others 1
(b) one 1 and ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.