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what's wrong ? why?

jeny jn

#include "reg51.h"
main()
{
bit k;
k = ACC^7; //this instruction is right .
ACC^7 = 1; // this instruction is wrong! why?
}


thank you !

Parents
  • 0

    Note: ACC^7 is an expression (its meaning already explained), it is not "left_value" (it has no address => no write is possible), therefore you can't write :

    ACC^7 = 1;

    Perhaps it should be like this:

    #include "reg51.h"

sbit ACC7 = ACC^7; // first define bit of a bitaddressable base

main()
{
  bit k;

  k = ACC7;  // I think this was your
  ACC7 = 1;  // primary intention ?
}

Reply
  • 0

    Note: ACC^7 is an expression (its meaning already explained), it is not "left_value" (it has no address => no write is possible), therefore you can't write :

    ACC^7 = 1;

    Perhaps it should be like this:

    #include "reg51.h"

sbit ACC7 = ACC^7; // first define bit of a bitaddressable base

main()
{
  bit k;

  k = ACC7;  // I think this was your
  ACC7 = 1;  // primary intention ?
}

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