Appendix H Optional Functions
H.2 Security
A-128
( 7 ) Security-related System Registers
The security setting status can be checked by using the following system registers.
( 8 ) Application Precautions
• The security settings data is saved in flash memory.
When starting from flash memory, an operation will be performed according to the status when data was saved to
flash memory. Therefore, be sure to save the data to flash memory after making the security settings if the Con-
troller will be started from flash memory.
• Security function does not apply when offline (i.e., when the MPE720 is used alone).
You cannot make security settings even if you log on offline. Manage offline data so that applications are pro-
tected from being disclosed.
• Always enter at least one alphanumeric character for the security key.
To ensure security, at least one alphanumeric character must be entered in the security key. Although no key can
guarantee foolproof security, you can increase the security of your key by entering a mixture of uppercase, low-
ercase, and numeric characters (e.g., A to Z, a to z, and 0 to 9).
Name Register Number Description
Security Status SW00506
0: No security, 1: Security set
Security Reading
Restriction Information
SW00507
SB005070 to SB005073
File Reading Restriction Privilege
SW00507=***xH
x: Restriction privilege level (0 to 7)
SB005074 to SB005076
Reserved by system.
SB005077
0: File reading not restricted
1: File reading restricted
SB005078 to SB00507F
Reserved by system.
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