ST9291 Overview
Register oriented 8/16 bit CORE with RUN, WFI and HALT modes Minimum instruction cycle time: 500ns (12MHz internal) 16 to 48K bytes of ROM, 384/640 bytes of RAM, 224 general purpose registers available as RAM, accumulators or index registers (Register File) 42-lead Shrink DIP package or 56-lead Shrink DIP package Interrupt handler and Serial Peripheral Interface as standard.