The DS80C320 microcontroller was the first member of the new High–Speed Micro Family from Dallas Semiconductor. Since its introduction in 1993, there have been a number of new micros introduced which include new features and peripherals. The family now includes the DS80C310, DS87C520, and DS87C530, among others. The DS80C320 is unique in the family because it has slightly different external memory interface timing than the other members. When the DS80C320 was introduced, an application note (#57) was published to describe the speed requirements for the memories that interfaced to it. This application note serves the same purpose for the more recent family introductions.