ABL electronic PIC Microcontrollers PIC16 - Manual (Page 98)

Static
Global name declared with
static
specifier has internal linkage, meaning that it
is local for a given file. See Linkage for more information.
Local name declared with
static
specifier has static duration. Use
static
with
a local variable to preserve the last value between successive calls to that function.
See Duration for more information.
Extern
Name declared with
extern
specifier has external linkage, unless it has been pre-
viously declared as having internal linkage. Declaration is not a definition if it has
extern
specifier and is not initialized. The keyword
extern
is optional for a
function prototype.
Use the
extern
modifier to indicate that the actual storage and initial value of a
variable, or body of a function, is defined in a separate source code module.
Functions declared with
extern
are visible throughout all source files in a pro-
gram, unless you redefine the function as
static
.
See Linkage for more information.
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