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68HC05 Microcontrollers

Tekmos has developed a 68HC05 design that can be used to replace many variations of the 68HC05 and 68705 microcontrollers. Our first part will be the TK68HC05B6, with 6K of ROM. Our second part will be the user programmable TK68HC705C8A / TK68HC705C9A devices. These parts will use flash memory as contrasted to the original part’s One Time Programmable (OTP) EPROM. The 68HC705B16N and 68HC705B32 will be available with a longer lead time.

The Tekmos 68HC05 design has been carefully designed to duplicate the original 68HC05 on a clock for clock basis. This guarantees complete compatibility with existing code. Even timing loops will work perfectly.

Tekmos is currently seeking customers willing to evaluate our daughtercard-based breadboard in their system for the purposes of design verification.

Below is a list of 68HC05 microcontroller variants that are either available immediately or under development. If you need a version not listed here then please contact us at This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Part Number Description Datasheet
TK68HC05B6 Microcontroller, 68HC05, 6K Masked ROM icon TK68HC05B6
TK68HC705B16N Microcontroller, 68HC05, 16K Flash Coming Soon
TK68HC705B32 Microcontroller, 68HC05, 32K Flash Coming Soon
TK68HC705C8A Microcontroller, 68HC05, 8K Flash icon TK68HC705C9A
TK68HC705C9A Microcontroller, 68HC05, 16K Flash icon TK68HC705C9A