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參數(shù)資料
| 型號： | UPD78P368A |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8 BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 16 / 8位單片機 |
| 文件頁數(shù)： | 22/52頁 |
| 文件大?。?/td> | 545K |
| 代理商： | UPD78P368A |
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22
m
PD78P368A
5. ERASURE CHARACTERISTICS (
m
PD78P368AKL-S ONLY)
Data written in the
m
PD78P368AKL-S program memory can be erased (FFH); therefore users can write other data
in the memory.
To erase the written data, expose the erasure window to light with a wavelength shorter than approx. 400 nm. Normally,
ultraviolet light with a wavelength of 254 nm is employed. The amount of light required to completely erase the data
is as follows:
Intensity of ultraviolet light
￥
erasing time: 15 Ws/cm
2
min.
Erasing time: 15 to 20 minutes (When using a 12,000
m
W/cm
2
ultraviolet lamp. It may, however, take more time
due to lamp deterioration, dirt on the erasure window, or the like.)
The ultraviolet lamp should be placed within 2.5 cm from the erasure window during erasure. In addition, if a filter
is attached to the ultraviolet lamp, remove the filter before erasure.
6. PROTECTIVE FILM COVERING THE ERASURE WINDOW (
m
PD78P368AKL-S ONLY)
After the erasure window of the
m
PD78P368AKL-S has been exposed to sunlight or a fluorescent lamp for a long
time, data in EPROM may be erased and the internal circuits may malfunction. To prevent these failures, the erasure
window should be covered with a protective film when it is not used for erasure.
EPROM package products with a window are supplied with a NEC-guaranteed protective film when they are
delivered.
7. SCREENING ONE-TIME PROM PRODUCTS
NEC cannot execute a complete test of one-time PROM products (
m
PD78P368AGF-3B9) due to their structure
before shipment. It is recommended that you screen (verify) PROM products after writing necessary data into them
and storing them at 125 °C for 24 hours.
NEC offers a charged service called QTOP
microcomputer service. This service includes writing to one-time
PROM, marking, screening, and verification. Ask your sales representative for details.
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