This is a software module of M3L-bus by using Asynchronous/Synchronous serial channel (USART) in synchronous mode for C16X microcontroller family. The M3L-bus is used mainly to communicate between the microcontroller and Television application IC like MegaText, and Compact Text. 4 Introduction to M3L-bus . 3 5 M3L-bus Specifications.. 3 5.1 Data Transfer Formats 3 5.2 Timing Diagram 5 5.3 Hardware Connection 7 6 Description of Software... 8 6.1 Software Concept ...... 8 6.2 Description of Module Subroutines9 6.3 Compilation of Software... 13