The DS80C320 microcontroller was the first member ofthe new High–Speed Micro Family from Dallas Semiconductor.Since its introduction in 1993, there havebeen a number of new micros introduced which includenew features and peripherals. The family now includesthe DS80C310, DS87C520, and DS87C530, amongothers. The DS80C320 is unique in the family because ithas slightly different external memory interface timingthan the other members. When the DS80C320 wasintroduced, an application note (#57) was published todescribe the speed requirements for the memories thatinterfaced to it. This application note serves the samepurpose for the more recent family introductions.