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4508 Datasheet(PDF) 67 Page - Renesas Technology Corp

Part # 4508
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4508 Datasheet(HTML) 67 Page - Renesas Technology Corp

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4508 Group
Rev.1.02
2006.12.22
page 67 of 140
REJ03B0148-0102
24
QzROM
(1) Be careful not to apply overvoltage to MCU. The contents of
QzROM may be overwritten because of overvoltage. Take care
especially at turning on the power.
(2) As for the product shipped in blank, Renesas does not perform
the writing test to user ROM area after the assembly process
though the QzROM writing test is performed enough before the
assembly process. Therefore, a writing error of approx.0.1 %
may occur. Moreover, please note the contact of cables and for-
eign bodies on a socket, etc. because a writing environment may
cause some writing errors.
Notes On ROM Code Protect
(QzROM product shipped after writing)
As for the QzROM product shipped after writing, the ROM code
protect is specified according to the ROM option setup data in the
mask file which is submitted at ordering.
The ROM option setup data in the mask file is “0016” for protect
enabled or “FF16” for protect disabled.
Note that the mask file which has nothing at the ROM option data
or has the data other than “0016” and “FF16” can not be accepted.
25


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