M37544 Datasheet, PDF (47/68 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7544 Group
Precaution for Handling One-Time-Programmable
Devices
Our company ships one-time-programmable version MCUs (One-
Time PROM MCU) without being screened by the PROM writing
test.
To ensure the reliability of the MCU, We recommend that the user
performs the program and test procedure shown in Figure 62
before using the MCU.
Programming with
PROM programmer
Screening (Caution)
(150 °C for 40 hours)
Verification with PROM
programmer
Functional check in
target device
Caution: The screening temperature is far higher
than the storage temperature. Never
expose to 150 °C exceeding 100 hours.
Fig. 62 Programming and testing of One Time PROM
Rev.1.04 2004.06.08 page 47 of 66
REJ03B0012-0104Z