M16C62_N Datasheet, PDF (195/621 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY

Usage precaution
Mitsubishi microcomputers
M16C / 62 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
External ROM version
The external ROM version is operated only in microprocessor mode, so be sure to perform the following:
• Connect CNVss pin to Vcc.
• Fix the processor mode bit to “112”
Built-in PROM version
(1) All built-in PROM versions
High voltage is required to program to the built-in PROM. Be careful not to apply excessive voltage.
Be especially careful during power-on.
(2) One Time PROM version
One Time PROM versions shipped in blank (M30620ECFP, M30620ECGP), 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. Therefore ROM
write defectiveness occurs around 5 %. To improve their reliability after programming, we recommend
to program and test as flow shown in Figure 1.24.1 before use.
Programming with PROM programmer
Screening (Note)
(Leave at 150˚C for 40 hours)
Verify test PROM programmer
Function check in target device
Note: Never expose to 150˚C exceeding 100 hours.
Figure 1.24.1. Programming and test flow for One Time PROM version
(3) 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 information.
A shield to cover the transparent window is available from Mitsubishi Electric Corp. Be careful that
the shield does not touch the EPROM lead pins.
• Clean the transparent glass before erasing. Fingers’ flat and paste disturb the passage of ultraviolet
rays and may affect badly the erasure capability.
• The EPROM version is a tool only for program development (for evaluation), and do not use it for the
mass product run.
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