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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272
INTERFACING: KEYBOARDS
Vcc
Vcc
P1.0 P1.1 P1.2
INPUT
(a) (b)
P1.3 P1.4
INPUT OUTPUT
P1.0 P1.1 P1.2 P1.3 P1.4
Figure 18.6 (a) 1D and (b) 2D array of keys
What would be the maximum number of keys that might be interfaced with only fi ve port pins? In
Fig. 18.6(a), using a linear arrangement, we can interface only fi ve keys. On the other hand, as shown in Fig. 18.6(b),
the two-dimensional layout would allow us to interface six keys with fi ve port pins. It may be noted in these two
cases that all port pins are in their input mode for the fi rst confi guration. In the second confi guration, three are
output and two are input pins. Similarly, eight port pins ...
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