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TMP86FS49AIUG датащи(PDF) 273 Page - Toshiba Semiconductor

номер детали TMP86FS49AIUG
подробное описание детали  8 Bit Microcontroller
PDF  296 Pages
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производитель  TOSHIBA [Toshiba Semiconductor]
домашняя страница  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TMP86FS49AIUG датащи(HTML) 273 Page - Toshiba Semiconductor

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Page 257
TMP86FS49AIUG
Figure 20-5 Password Comparison
20.10.1Password String
The password string transmitted from the external controller is compared with the specified data in the flash
memory. When the password string is not matched to the data in the flash memory, the device enters the halt
condition due to the password error.
20.10.2Handling of Password Error
If a password error occurs, the device enters the halt condition. In this case, reset the device to reactivate the
serial PROM mode.
20.10.3Password Management during Program Development
If a program is modified many times in the development stage, confusion may arise as to the password.
Therefore, it is recommended to use a fixed password in the program development stage.
Example :Specify PNSA to F000H, and the password string to 8 bytes from address F001H
(PCSA becomes F001H.)
Password Section code abs = 0F000H
DB
08H
: PNSA definition
DB
“CODE1234”
: Password string definition
08H
01H
02H
03H
04H
05H
08H
F012H
F107H
F108H
Flash memory
F109H
F10AH
F10BH
F10CH
UART
F0H 12H F1H 07H 01H 02H 03H 04H 05H 06H 07H
08H
PNSA
PCSA
Password string
06H
07H
F10DH
F10EH
"08H" becomes
the umber of
passwords
8 bytes
Compare
Example
PNSA = F012H
PCSA = F107H
Password string = 01H,02H,03H,04H,05H
06H,07H,08H
RXD pin



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