In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Here is a SX20 in an 8 pin DIP.
 

This one features:

 

  Direct connection of SX-Key to pins 5-8.

 

  All parts on top side (except optional resonator)

 

  Access to pins RB.0 thru RB.3 

    Allows use of comparitor & pin interrupts

    RTCC is connected to RB.3

 

If you only need 4 I/O pins this design is really easy to program and debug.

 

Bean

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