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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27.9 | SOLVED EXAMPLES
respectively. e reset input for 8255, which is active high, may be obtained from the system reset input
as illustrated in Fig. 27.6. Details of this reset circuit is already presented in Fig. 2.12. Finally, for the chip
enable (CE) input of 8255, we may directly connect its pin 6 with the highest address output from 8051,
that is A15 from P2.7.
As the CE input of 8255 is available directly from A15, therefore internal registers of 8255 would need
16-bit addresses for communication. ese addresses are presented in Table 27.2. By sending appropriate
command word to the CWR, 8255 may be initialized to function in ...
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