UPD78P083GB-3BS-MTX-A Datasheet, PDF (28/58 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78P083
*
5. PROGRAM ERASURE (µPD78P083DU ONLY)
The µPD78P083DU is capable of erasing (FFH) the data written in a program memory and rewriting.
To erase the programmed data, expose the erasure window to light having a wavelength shorter than about 400 nm.
Normally, irradiate ultraviolet rays of 254-nm wavelength. The amount of exposure required to completely erase the
programmed data is as follows:
• UV intensity x erasing time : 30 W•s/cm² or more
• Erasure time: 40 min. or more (When a UV lamp of 12,000 µW/cm² is used. However, a longer time may be needed
because of deterioration in performance of the UV lamp, soiled erasure window, etc.)
When erasing the contents of data, set up the UV lamp within 2.5 cm from the erasure window. Further, if a filter is provided
for a UV lamp, irradiate the ultraviolet rays after removing the filter.
6. OPAQUE FILM ON ERASURE WINDOW (µPD78P083DU ONLY)
To protect from unintentional erasure by rays other than that of the lamp for erasing EPROM contents, or to protect internal
circuit other than EPROM from misoperating by rays, cover the erasure window with an opaque film when EPROM contents
erasure is not performed.
7. ONE-TIME PROM VERSION SCREENING
The one-time PROM version (µPD78P083CU, 78P083GB-3B4, 78P083GB-3BS-MTX) cannot be tested completely by
NEC before it is shipped, because of its structure. It is recommended to perform screening to verify PROM after writing
necessary data and performing high-temperature storage under the condition below.
Storage Temperature
125°C
Storage Time
24 hours
*
NEC offers for an additional fee one-time PROM writing to marking, screening, and verify for products designated as
"QTOP Microcontroller". Please contact an NEC sales representative for details.
26