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18.2.2 Precautions on one time PROM version
One time PROM version shipped in a blank (M37751E6CFP), of which built-in PROM is programmed by
users, is also provided.
For the microcomputer, a programming test and screening are not performed in the assembly process and
the following processes. To improve their reliability after programming, we recommend to program and test
as the flow shown in Figure 18.2.2 before use.
Fig. 18.2.2 Programming and test flow for One Time PROM version
18.2.3 Precautions on EPROM version
Cover the transparent glass window with a shield or others during the read mode because exposing to
sun light or fluorescent lamp can cause erasing the programmed data.
Be careful that the shield does not touch the EPROM lead pins.
A shield to cover the transparent window is available from Mitsubishi Electric Corporation.
Clean the transparent glass before erasing. There is a possibility that fingers' fat and paste disturb the
passage of ultraviolet rays and affect badly the erasure capability.
The EPROM version is a tool only for program development, evaluation only, and do not use it for the
mass product run.
Programming with PROM programmer
Screening (Leave at 150 °C for 40 hours) (Note)
Verify test with PROM programmer
Function check in target device
Note: Never expose to 150 °C exceeding 100 hours.
7751 Group User's Manual
PROM VERSION
18.2 Usage precaution
18–11
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