M16CSLASH62 datasheet(195/621 Pages) RENESAS

195 / 621 page

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Usage precaution

180

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.

(3) EPROM version

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

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”

• 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.

M16C/62 Datasheet(PDF) 195 Page - Renesas Technology Corp