By Andrew Colin (Auth.)
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Additional resources for Programming for Microprocessors
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In a system that has been poorly thought out, short addresses can make a programmer's work very much harder. Options This final section deals with some of the features that can make a microprocessor especially suitable for particular applications. Parity detection If a microprocessor is used for communication and handles characters received from remote places, much of its work will lie in checking the accuracy of transmission. This will involve calculating the parity of every character received.
The chief value of this facility lies in writing programs that it is thought may need to be changed later. For example, consider a program that refers extensively to peripheral interface 3. Two possible versions are: (a) (b) OUTPUT 3 P:=3 OUTPUT Ρ OUTPUT 3 OUTPUT Ρ OUTPUT 3 OUTPUT Ρ OUTPUT 3 OUTPUT Ρ Suppose that, for some reason, it became necessary to use a different peripheral interface, such as 8. In program (a), it would be necessary to change every output instruction. In program (b), however, only the definition need be altered.