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8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
book

8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition

by Subrata Ghoshal
May 2024
Intermediate to advanced
534 pages
17h 58m
English
Pearson India
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
112
SUBROUTINES AND STACK
8.13 | Parameter Passing in Subroutines
One important point to be noted through Example 8.1 is the way diff erent parameters were passed from the
main program to the subroutine and vice versa.  e subroutine needs a correct value at R0, which was initially
taken care of by the main program. After the fi rst iteration, the subroutine itself updates this register so that,
at every iteration, it starts with a correct value in R0.
Similarly, the product from the subroutine is passed to the main program through the accumulator. After
receiving it, the main program processes it and releases the accumulator to the subroutine ...
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Publisher Resources

ISBN: 9781322206578