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參數(shù)資料
| 型號(hào)： | μPD78P054 |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8 Bit Single Chip Microcontrollers |
| 中文描述： | 8位單片機(jī)微控制器 |
| 文件頁(yè)數(shù)： | 30/86頁(yè) |
| 文件大?。?/td> | 502K |
| 代理商： | ΜPD78P054 |
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30
μ
PD78P054, 78P058
6. ERASURE METHOD (
μ
PD78P054KK-T, 78P058KK-T ONLY)
The
μ
PD78P054KK-T and 78P058KK-T are capable of erasing (FFH) the contents of data written in a program
memory and rewriting.
When erasing the data, irradiate light having a wavelength of less than about 400 nm to the window on the top of
the package. Normally, ultraviolet rays of 254-nm wavelength should be used. Volume of irradiation required to
completely erase the data is as follows:
UV intensity
×
erasing time : 30 Ws/cm
2
or more
Erasing time : 40 minutes or more (When a UV lamp of 12 mW/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 data, set up the UV lamp within 2.5 cm from the erasing window. Further, if a filter is provided
on the UV lamp, remove the filter during the erasure process.
7. ERASURE WINDOW OPAQUE FILM (
μ
PD78P054KK-T, 78P058KK-T ONLY)
To protect from unintentional erasure by other than EPROM erasure lamp light, or to protect internal circuits other
than EPROM from malfunction due to light coming in through the window, mask the window with the attached opaque
film except when EPROM erasure is performed.
8. SCREENING OF ONE-TIME PROM VERSIONS
The one-time PROM versions (
μ
PD78P054GC-3B9, 78P054GC-8BT, 78P054GK-BE9, and 78P058GC-8BT)
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 conditions
below.
Storage Temperature
Storage Time
125
°
C
24 hours
At present, a fee is charged by NEC for one-time PROM writing, marking, screening, and verify service for the QTOP
Microcontroller. For details, contact your sales representative.
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