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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10.5 | Solved Examples
Example 10.1
Purpose: To keep a sub-routine ready for XORing 2 bits as no single instruction is available. It also shows
the usage of ANL C, /bit and ORL C, /bit instructions.
Problem
Develop a sub-routine to XOR 2 directly addressable bits and store the result in CY fl ag. Assume the bit
addresses to be 78H and 79H, and condition of these 2 bits should remain unchanged.
Solution
As direct XOR with bit variables is not available in the instruction set of MCS-51, we may use ANL C, /bit
instruction twice by interchanging bits and then logically OR the results. A sample sub-routine is presented
below, which uses bit 1 of PSW ...
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