Additional requirements for high noise environments:

Use an external oscillator. If you insist on using a crystal then the layout and component selection is critical. If you need to use the clock for something else as well then *do not* use a crystal. Use an oscillator, with source terminated traces from the oscillator to each clock destination.

Use surface-mount construction with a tight layout. Keep traces short, and no loops.

Use a supervisor with a push-pull output. This has low output impedance to help absorb noise. If not a push-pull output then put a small (i.e. 220pf) ceramic capacitor on the processor reset line (to ground) right at the processor.

By the way, multi-layer PCB construction with solid ground and power planes is mandatory.

We have 8052 based controllers operating without problems *inside* 36KW 1KV high frequency switching power supplies, so I know it can be done.