Data processing system, specially for real-time applications

Claim 1

Data processing system, particularly for real-time applications requiring a relatively moderate processing capability, which comprises: a. a processor comprising: i. a plurality of registers, j. means for interrupting a processing program or subprogram, k. means for performing said processing program or subprogram, and for performing at least one subprogram necessary for a real-time application upon the occurrence of an interruption caused by said interrupting means, and subsequently, upon completion of said subprogram necessary for a real-time application, for resuming the performance of the previously interrupted program or subprogram, b. a plurality of safeguard storages consisting each of a stack of N independent and sequentially addressable registers, c. means for controlling a transfer of the contents of all the registers of said processor to at least one of said safeguard storages in a predetermined sequential order when a program or subprogram is interrupted and for re-loading the registers of said processor with said contents previously transferred to at least one of said safeguard storages in a sequential order reverse with respect to said predetermined order when resuming said interrupted program or subprogram, d. and at least one bus line connecting said registers of said processor to said safeguard storages for transferring said contents, and said interrupting means to said performing means for transmitting an interrupt signal from said interrupting means to said performing means.