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80C51 1Header

TK68HC705C9A HC05 Microcontroller, 16K Flash


The TK68HC705C9A can be ordered directly from Tekmos:  Ordering3


The TK68HC705C9A is an 8-bit microcontroller with the following features:

  • Pin compatible, timing compatible replacement for the industry standard 68HC05 family CPU
  • New HC705C8A Mode
  • HC705C12A Mode
  • Fully static design supports operation from 0 to 4.2 MHz at 5 volts
  • Embedded memory with:
    • 352 / 176 / 304 bytes of RAM in C9A / C12A / C8A mode
    • 15,932 / 12,092 / 7, 774 bytes of Flash in C9A / C12A / C8A mode
  • Advanced peripherals including:
    • Three 8-bit parallel I/O ports
    • One 7-bit parallel I/O port
    • 16-bit timer with input capture and output compare
    • Serial Peripheral Interface (SPI)
    • UART (SCI) with independent baud rate selection and receiver wake up function
    • Watchdog timer
    • Clock Monitor
    • 5 Interrupt sources, including the port B pins
    • High current drive on PC7
  • Bootstrap mode
  • Multiple power saving modes
  • On chip crystal oscillator
  • Flash memory allows reprogramability
  • Available in 44-pin PLCC package
  • -40°C to +85°C operating temperature
  • Direct replacement for NXP 68HC705C9A microcontroller
  • Direct replacement for NXP 68HC705C8A microcontroller
  • Also available as a ROM based 68HC05C8A
  • Implemented with the Tekmos Customer Configured Microprocessor (CCM) technology


General Description 

The TK68HC705C9A is a derivative of the HC05 microcontroller architecture. With a rich set of RAM, ROM, and Flash memory and a full set of peripherals, the TK68HC705C9A is well suited to a variety of controller tasks. The part has been designed to be a drop-in replacement for the NXP 68HC705C9A or 68HC705C8A, with identical code execution, pin compatibility, and equivalent timing.

The program storage in the TK68HC705C9A is implemented with Flash memory. This memory can be erased and reprogrammed as desired.

In addition to the C12A emulation mode, Tekmos has added a C8A emulation mode. This mode modifies the pinout to match the C8A configuration.



The data sheet is available here: pdf TK68HC705C9A (125 KB)



The data sheet is available here:  pdf Tekmos Device Programmer TK68HC7xx (286 KB)


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