Abstract: Using real-time operating system kernel to manage multi-tasking is a trend in current embedded applications,and embedded applications for the device were severely limited because of its limited resources, so singlccore processor has been unable to well meet some of the practical applications, thus this paper designed and implemented a real-time multi-tasking preemptive Webit quad-core processor system is based on 8 bit AVR singlechips, and it generally retains the main features of the Webit2. 0 kernel. Webit ctuad-core processor system uses four AT90S8515 singlechips which are connected through the ISA bus to process multi-tasking in parallel,and experimental results show that its performance was improved greatly.

Key words: Embedded system, Webit2. 0, Webit quad-core processor, Real-time multi-tasking, Parallel processing