This manual deals with the des cription of the instructionset and addressing modes of ST62,63microcontroller series. The manual is divided intwo main sections. The first one includes, after ageneral family des cription, the addressing modesdes cription. The second section includes the detaileddes cription of ST62,63 instruction set. Eachinstruction is described in detail with the differencesbetween each ST6 series.ST6 software has been designed to fully use thehardware in the most efficient way possible whilekeeping byte usage to a minimum; in short to providebyte efficient programming capability.