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UPD784938 Datasheet, PDF (662/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers
CHAPTER 26 RESET FUNCTION
26.2 Caution
Reset input when powering on must remain at the low level until oscillation stabilizes after the supply voltage has reached
the prescribed voltage.
662
Preliminary User’s Manual U13987EJ1V0UM00