UPD78014 datasheet(28/58 Pages) RENESAS

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µPD78P083

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.

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.

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

Storage Time

125

°C

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.

UPD78014 Datasheet(PDF) 28 Page - Renesas Technology Corp