External Bus Interface

EBI
The 68HC05CO is an expandable 68HC05 microcontroller which does not have any on-chip user-programmable ROM. The EBI can address up to 64k of external memory using either a multiplexed or non-multiplexed external bus. As such, they are available off the shelf without mask charge or delay.

CS
The 68HC05C0 also has chip selects (CS) that are used with the EBI to directly interface with external memory or peripherals. No glue logic is required to decode the address and control lines.

last update: 10JUL1997