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BUILT-IN PROM VERSION

7733 Group User’s Manual

19-10

19.2 Usage precaution

[Precautions on all built-in PROM versions]

When programming to the built-in PROM, high voltage is required. Accordingly, be careful not to apply

excessive voltage to the microcomputer. Furthermore, be especially careful during power-on.

[Precautions on One Time PROM version]

One Time PROM versions shipped in blank (M37733EHBFP, M37733EHLHP), of which built-in PROMs are

programmed by users, are also provided.

For these microcomputers, 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 19.2.1 before use.

19.2 Usage precaution

Fig. 19.2.1 Programming and test flow for One Time PROM version

[Precautions on EPROM version]

qCover 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.

A shield to cover the transparent window is available from Mitsubishi Electric Corporation. Be careful that

the shield does not touch the EPROM lead pins.

qClean the transparent glass before erasing. There is a possibility that fingers’ flat and paste disturb the

passage of ultraviolet rays and affect badly the erasure capability.

qThe 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 (Note)

(Leave at 150

°C for 40 hours)

Verify test with PROM programmer

Function check in target device

Note: Never expose to 150

°C exceeding 100 hours.

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