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參數(shù)資料
| 型號： | μPD78P048A |
| 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位單片機微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 28/72頁 |
| 文件大?。?/td> | 387K |
| 代理商： | ΜPD78P048A |
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m
PD78P048A
28
6. ERASURE METHOD (
m
PD78P048AKL-S ONLY)
The
m
PD78P048AKL-S is capable of erasing (FFH) the contents of data written in a program memory and rewriting.
When erasing the contents of data, irradiate light having a wavelength of less than about 400 nm to the erasing
window. Normally, irradiate ultraviolet rays of 254 nm wavelength. Volume of irradiation required to completely erase
the contents of data is as follows:
UV intensity
￥
erasing time: 30 Ws/cm
2
or more
Erasing time: 40 minutes (MIN.) (When a UV lamp of 12,000
m
W/cm
2
is used. However, a longer time may
be needed because of deterioration in performance of the UV lamp, contamination of the erasing
window, etc.)
When erasing the contents of data, set up the UV lamp within 2.5 cm from the erasing window. Further, if a filter
is provided for a UV lamp, irradiate the ultraviolet rays after removing the filter.
7. ERASURE WINDOW SEAL (
m
PD78P048AKL-S ONLY)
To protect from miserasure by rays other than that of the lamp for erasing EPROM contents, or to protect internal
circuit other than EPROM from misoperating by rays, stick a protection seal on the erasure window when EPROM
contents erasure is not performed.
8. ONE-TIME PROM PRODUCTS SCREENING
The one-time PROM product (
m
PD78P048AGF-3B9) can not 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
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