Carrol Touch TouchSystems CarrollTouch Prog, Programmer'S Manual, Page: 40 / 274

CARROLL TOUCH Chapter 3 - General Programming Issues
Touch System Programmer’s Guide 3-11
Interrupt Mode
When using interrupt mode, the touch controller uses a PC hardware
interrupt to notify the application software that touch data is available in
the Data Register (Base Address). When the display is touched with
touch enabled, or an information request command is received by the
touch system, the touch system sends touch data to the Data Register.
The HBC then interrupts the host computer, indicating that data is
available in the Data Register. The application software’s interrupt
handler should perform an I/O read of the Data Register to receive a byte
of touch data from the touch system.
Resetting the HBC
The procedure to perform a hardware reset on the HBC is the same for
both interrupt and polling communication modes. To cause a hardware
reset of the touch controller, perform an I/O write to the Hardware Reset
Register (Base A 2).
Note that the value of the data byte written to the Hardware Reset
Register does not matter.