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5. Device Operation

KeyWarrior24D registers as a standard HID

keyboard and supports boot protocol. It does not

need any special drivers to be installed, standard

system drivers are sufficient.

The country code is 0 for not localized hardware,

which allows to use a single version of the chip for

all international keyboard layouts. Usage codes are

defined for 0 to 223, which includes all keys and

reserved codes below the modifiers, as well as the

compose keys for Asian languages and several

special keys that may or may not be supported by

individual operating systems.

5.1 Power Up

Every time the supply voltage is applied

KeyWarrior24D executes an internal reset

sequence. All internal pull up resistors are disabled

upon power up and will be activated during the

internal reset sequence.

5.2 How to use KW24D

KeyWarrior24D turns an 8 bit code and six status

lines for modifier keys into a USB keyboard data

report.

To generate a keystroke the HID usage code (see

the "KeyWarrior Scancode Tables" document for a

complete list of the keyboard usage codes) for the

required key is applied to D0..7. The status of any

modifier keys to be combined with this key is indi-

cated by pulling the corresponding pin low.

For example if a capital "A" should be produced

put $04 on D0..7 and pull down /R-Shft.

After applying the data make sure /ACK is high,

then pull down /STRB. /STRB may be pulled low

only when /ACK is high.

Then wait for KeyWarrior24D to pull down /ACK.

This signals that KeyWarrior24D has accepted the

data. Release /STRB and do not pull it low again

until /ACK has returned to high state.

All minimum setup and hold times are 0.

KeyWarrior24D will send the usage code as a short

key press.

5.3 Modifier keys

Modifier keys are input to KeyWarrior24D by

separate control lines. They can be transmitted in

combination with a key code. If only a change of

the status of the modifiers is intended apply a $00

to D0..7, which is the "idle" code for no key

pressed.

If the HOLD input is pulled high the status of the

modifier keys will stay valid until the next status is

passed to KeyWarrior24D on the next falling edge

of /STRB. When HOLD is low (default status due

to internal pull down resistor) the modifier keys

will return to idle after the keystroke.

V 1.0.0, December 2nd 2013, for chip revision 1.1.1.D and up