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Single-Chip Microcontrollers User's Manual

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CHAPTER 26
µ
PD78P058F, 78P058FY
26.4 Screening of One-Time PROM Versions
One-time PROM versions cannot be fully tested by NEC before shipment due to the structure of one-time PROM.
Therefore, after users have written data into the PROM, screening should be implemented by user: that is, store
devices at high temperature for one day as specified below, and verify their contents after the devices have returned
to room temperature.
Storage Temperature Storage Time
125°C 24 hours