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The TPIC0108 is the perfect chip to use because it supports all four modes. However, it does not have an enable input. This can be provided using a PAL/CPLD. The ATF750C-15SC (SO24 package) is a good option because it has enough pins, and cheap enough at $2.14. The Needhams EMP-20 programmer can program this chip, provided that I get an SO-DIP convertor first (SO330-28p). Atmel provides WinCUPL that is free to create files for these devices.