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There are two timers that offer necessary delays on power-up. One is the Oscillator Start-up Timer (OST), intended to keep the chip in reset until the crystal oscillator is stable. The other is the Power-up Timer (PWRT), which provides a fixed delay of 72 ms (nominal) on power-up only and is designed to keep the part in reset, while the power supply stabilizes. With these two timers on-chip, most applications need no external reset circuitry.
Аналогично написано, и так действительно есть (неединичный опыт), в DS30325A-page 95. Т.е. без watchdog-а работать нормально нельзя. А он немножко потребляет.
Насчёт у кого лучше, так у C8051FXXX, у многих 68HC7XX с выводом наружу. У Атмела с этим сами знаете как.
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