METHOD FOR THE SERIAL TRANSFER OF DATA BETWEEN TWO ELECTRONIC BUS STATIONS AND COMMUNICATION SYSTEM

摘要

The invention relates to a simple serial data transfer method for the exchange of data between two electronic bus stations (33, 32). The bus connection consists of two lines wherein the first line is dedicated to data/control signals and a second line (19) is dedicated to a power supply voltage. A data transfer from the transmitting station (33) to the receiving station (32) is started by pulling the first line to an activated potential for a first period of time (Tactive). After elapse of the first period of time (Tactive) the transmitting station leaves said first line (22) inactive for a second period of time (Tactive). The transmitting station commences data transmission via said first and second line after elapse of said second period of time (Tactive). Preferably, data is transferred in a number of blocks in the data frame. The first block concerns a synchronization block and the last block is a checksum block. An acknowledgement is made at the end of a data frame simply by pulling the first line (22) to its activated potential through the receiving station (32) for another period of time (Tack). A corresponding communication system is also disclosed. The data transfer method as well as the corresponding communication system can be used in consumer electronic products like portable devices where the portable devices are equipped with a wired remote control (4). Data transfer between main microprocessor in the portable device and a remote microprocessor in the remote controller will be made in accordance with the invention.