16-bit embedded controller at 20 MHz — what the ratings mean for the BOM
The 20 MHz clock sets the timing for bus cycles and DRAM refresh. At this speed, wait states may be needed with slower EPROM or peripheral devices — the datasheet's AC timing tables should be consulted for setup/hold margins. The on-chip DRAM controller handles the refresh overhead, which simplifies the board layout but ties the designer to the supported DRAM types listed in the controller's configuration registers.
Temperature grade and environment
Rated for 0°C to 70°C ambient, this part is suited for indoor, office, or telecom equipment where the enclosure is climate-controlled.