M3T-NC308WA V.5.00 Release 1

for the M32C/80 and M16C/80 series of MCUs

M3T-NC30WA V.5.00 Release 1

for the M16C/60, M16C/30, M16C/20, and M16C/10 series of MCUs

This problem may occur if the following nine conditions are satisfied:

(1)	Any one or more options are selected out of -O, -O[3-5], -OR, and -OS.
(2)	Option -ONBSD(-Ono_break_source_debug) is not selected.
(3)	An auto variable is assigned to a register.
(4)	An assignment expression "a" assigns a value to the auto variable in (3).
(5)	There exists an if or switch selection statement, and its conditional expression evaluates the value that has been assigned to a register.
(6)	An assignment expression "b" that assigns a value to the auto variable in (3) exists in any of the program statements listed below. These program statements are written in the selection statement in (5) * Either of the program statements for the if and else sections in an if-else statement. * The program statement for the if section in an if statement. * One or more, but not all, program statements for the case and default labels in a switch statement.
(7)	The right term of the assignment expression "b" is the variable evaluated in the conditional expression in (5).
(8)	The auto variable in (3) is never referenced after the conditional expression in (5) until the assignment expression "b" in (6) started.
(9)	The auto variable in (3) is referenced after the selection statement in (5) ended.

-----------------------------------------------------------
    char gc,gc2;
    void func(void)
    {
-
a            char c = 0;          /* Condition (4) */
-
            switch(gc){           /* Condition (5) */
            case    1:
            case    2:
-
b                 c = gc;         /* Conditions (6) and (7) */
-
                 break;
         default:
                 break;
         }
         if(c != 0){              /* Condition (9) */
                 gc2++;
         }
    }
-----------------------------------------------------------

This problem will be circumvented in any of the following ways:

(1) Compile programs after deselecting the -O, -O[3-5], -OR, and -OS options.

(2) Use option -ONBSD(-Ono_break_source_debug).

(3) Place a dummy asm function immediately before the if or switch statement.

[Example]
-----------------------------------------------------------
   char gc,gc2;
   void func(void)
   {
       char c = 0;
       asm();               /* A dummy asm function placed */
       switch(gc){
       case    1:
       case    2:
               c = gc;
               break;
       default:
               break;
       }
       if(c != 0){
               gc2++;
       }
   }
-----------------------------------------------------------