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參數(shù)資料
| 型號(hào)： | μPD78P0208 |
| 廠商： | NEC Corp. |
| 英文描述： | 8 Bit Single Chip Microcontrollers(8位單片微控制器) |
| 中文描述： | 8位單片機(jī)微控制器（8位單片微控制器） |
| 文件頁(yè)數(shù)： | 29/72頁(yè) |
| 文件大小： | 424K |
| 代理商： | ΜPD78P0208 |
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29
m
PD78P0208
6. ERASURE CHARACTERISTICS (
m
PD78P0208KL-T ONLY)
Data written in the
m
PD78P0208KL-T 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: 30 W
s/cm
2
min.
Erasing time: 40 minutes or more (When using a 12000
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.
7. PROTECTIVE FILM COVERING THE ERASURE WINDOW (
m
PD78P0208KL-T ONLY)
To prevent EPROM from being erased inadvertently by light other than that from the lamp used for erasing EPROM,
or to prevent the internal circuits other than EPROM from malfunctioning by light, stick a protective film on the erasure
window except when EPROM is to be erased.
8. SCREENING ONE-TIME PROM PRODUCTS
NEC cannot execute a complete test of one-time PROM products (
m
PD78P0208GF-3BA) 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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