tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 372

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

22.12 Security
22. Serial PROM Mode
RA002
Note 1: *: Don’t care.
Note 2: When addresses from 0xFFE0 through 0xFFFF are filled with "0xFF", the product is recognized as a blank product.
Note 3: The data including the same consecutive data (three or more bytes) cannot be used as a password. (A password error
Note 4: In flash memory writing mode or RAM loader mode, the blank product receives the Intel Hex format data immediately after
Note 5: In executing the flash memory erase command, do not transmit a password string to a blank product.
occurs during password authentication. The TMP89FM42 does not transmit any data and goes into an idle state.)
receiving PCSA; it does not receive password strings. In this case, the subsequent processing is performed correctly
because the TMP89FM42 keeps ignoring incoming data until the start mark (0x3A ":") in the Intel Hex format is detected,
even if the external controller transmits the dummy password string. However, if the dummy password string contains
"0x3A", it is detected as the start mark erroneously, and the microcontroller enters the halt mode. If this causes a problem,
do not transmit the dummy password strings.
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