Universal Multiplexed Video/Data Link Using a Single-Chip Microcontroller
Original Publication Date: 1988-Jul-01
Included in the Prior Art Database: 2005-Feb-15
This article describes a technique for multiplexing a video signal with asynchronous data over a single wire data link using a single-chip microcontroller. Display systems presently available have parallel digital interconnections that use multiple wires to interface a controller and a display. For example, Fig. 1 shows the interface wiring between the CRT controller (CRTC) and the CRT monitor in such a system. The video horizontal sync (HS) and vertical sync (VS) signals drive the CRT monitor. The Monitor On signal turns the monitor on or off. The serial data link (SDL) carries asynchronous touch input data at 2400 baud. The Touch Controller On (TCON) signal enables or disables the touch controller hardware. The controller is remotely located from the monitor in a harsh automotive environment.