Denso BHT-200QW Spezifikationen PDF herunterladen (Seite 223)

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Chapter 14. Statement Reference

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Description:

Description:Description:

Description:

Assigning a string or a control code to a function key

KEY in syntax 1 assigns a string or a control code specified by stringdata to a function

key specified by keynumber. Pressing the specified function key generates the assigned

string data or control code and then passes it to the user program as if each character is

keyed in directly from the keyboard.

• keynumber is a key number assigned to a particular function key. (Refer to Appendix E,

"Key Number Assignment on the Keyboard.")

• Specifying 32 will be ignored.

• stringdata is a character code ranging from 0 (00h) to 255 (FFh). (For the character

codes, refer to Appendix C, "Character Sets.")

• If you specify more than two characters to stringdata, only the first two characters

are valid.

• stringdata inputted by pressing the specified function key may be read to the user

program by INPUT or LINE INPUT statement or INKEY$ or INPUT$ function.

Note that INKEY$ or INPUT$ (1) function can read only the first one character of the

assigned two. The second character remains in the keyboard buffer and can be read

by the INPUT or LINE INPUT statement or INKEY$ or INPUT$ function.

• If pressed together with the shift key, any numerical key can operate as a function key.

• If you issue more than one KEY statement specifying a same function key, the last

statement takes effect.

• If a null string is assigned to a function key, pressing the function key produces no key

entry. To make a particular function key invalid, you specify a null string to stringdata

as shown below.

KEY 1,""

KEY 2,CHR$(0)

KEY 3,CHR$(&h0)

Defining a function key as a backlight function on/off key

KEY in syntax 2 defines a function key specified by backlightkeynumber as a backlight

function on/off key and sets the length of backlight ON-time specified by onduration.

(Refer to Chapter 13, "Backlight Function.")

• backlightkeynumber is a key number assigned to a particular function key.

(Refer to Appendix E, "Key Number Assignment on the Keyboard.")

Pressing the specified backlight function on/off key activates or deactivates the

backlight function.

• Specifying a zero (0) or 32 to backlightkeynumber defines the combination of the

shift key and M4 key (key number 36) or the M4 key as a backlight function on/off key,

respectively.

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