Clearing Function-Key Definitions
The calculator has two program instructions for clearing the function-key definitions.
Why Clear the Function Keys?
There are several reasons to clear the function keys in a program.You may want to define a function key for a limited time. By clearing the function key, you erase the function description from the display and cancel the function definition.
If you use more than one menu in the program, you may need to clear some portion of the menu.
Example
For example, suppose you want to display the following menus at different points in a program. The first menu has five options.
The second menu has two options.
When defining the second menu, you cannot redefine just the [ F1 ] and [ F2 ] keys. You must also clear [ F3 ], [ F4 ], and [ F5 ]. Otherwise, the second menu would display:
How to Clear Function Keys
The calculator has instructions to clear function-key definitions either individually or all at once.In the previous example, it is more efficient to clear all the function keys before you redefine [ F1 ] and [ F2 ].
In a case where two menus are almost identical, except that the second menu has one or two fewer selections, it is more efficient to clear the function keys individually.
Use one of the following procedures within a program when you want to clear the function-key definitions.
- To clear all five definitions at once, use
[ 2nd ] [ DFN ] [ CLEAR ]
The mnemonic for [ 2nd ] [ DFN ] [ CLEAR ] is DFN CLR. - To clear the definition of a specific function key, use
[ 2nd ] [ DFN ] Fx [ CLEAR ]
where Fx represents the function key ( [ F1 ] - [ F5 ] ) that you want to clear.
The mnemonic for [ 2nd ] [ DFN ] Fx [ CLEAR ] is DFN Fx CLR.
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