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Common Questions & Answers
port_b.enable=0
}
How does the compiler determine TRUE and FALSE on expressions?
When relational expressions are assigned to variables, the result is always 0 or 1.
For example:
bytevar = 5>0;
bytevar = 0>5;
//bytevar will be 1
//bytevar will be 0
The same is true when relational operators are used in expressions.
For example:
bytevar = (x>y)*4;
is the same as:
if( x>y )
bytevar=4;
else
bytevar=0;
SHORT INTs (bit variables) are treated the same as relational expressions. They evaluate to 0
or 1.
When expressions are converted to relational expressions or SHORT INTs, the result will be
FALSE (or 0) when the expression is 0, otherwise the result is TRUE (or 1).
For example:
bytevar = 54;
bitvar = bytevar;
if(bytevar)
bytevar = 0;
bitvar = bytevar;
//bitvar will be 1 (bytevar ! = O)
//will be TRUE
//bitvar will be 0
How does the PIC? connect to a PC?
A level converter should be used to convert the TTL (0-5V_ levels that the PIC? operates with
to the RS-232 voltages (+/- 3-12V) used by the PIC?. The following is a popular configuration
using the MAX232 chip as a level converter.
333
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