Hi Larry,
Unfortunately, I am not aware of any S12 device qualified for the temperature range from -55°C.
There is one PowerPC MCU with that specification - MPC5554
http://www.nxp.com/products/microcontrollers-and-processors/power-architecture-processors/mpc5xxx-5x...
Some of our products are also delivered by e2v Company with such temperature range – from -55°C
http://www.e2v.com/products/semiconductors/processors/
http://www.e2v.com/news/e2v-adds-high-reliability-qorivva-microcontrollers-to-its-portfolio-of-semic...
I hope it helps you.
Have a great day,
RadekS
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