Usage Precaution
M30240 Group
Rev.1.00 Sep 24, 2003 Page 355 of 360
5.3 Usage Precaution
5.3.1 Built-in PROM versions
High voltage is required to program the built-in PROM. Do not apply excessive voltage. Use caution
during power on.
5.3.2 One-time PROM versions
Blank one-time PROM versions (M30240ECFP) are also shipped with those programmed by users. For
these microcomputers, a programming test and screening are not preformed in the assembly process
and subsequent processes. To improve their reliability after programming, we recommend programming
and testing before use. See Figure 5.5.
Figure 5.5: Programming and test flow for One-time PROM version
5.3.3 EPROM versions
• Cover the transparent glass window with a shield or a suitable equivalent during the read mode
because exposure to sun light or a fluorescent lamp can cause the information to be erased.
• A shield to cover the transparent window is available from Mitsubishi Electric Corp. Please ensure that
the shield does not touch the EPROM lead pins.
• Clean the transparent glass before erasing. Finger prints and paste disturb and inhibit the ultraviolet
rays and may adversely affect the erasure capability.
• The EPROM version is a tool only for program development (for evaluation) and should not be used
for mass production.
Program part with PROM programmer
Screening (Note)
(Leave at 150 C for 40 hours)
Verify part with
PROM programmer
Function check in target device
Note: Never expose to 150 C exceeding 100 hours.
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