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MaxLoader User’s Guide
74
NOTE: When you click on OPTION, device security mode and option fuses will
be available for certain manufacture devices. Selecting these options,
programmer will program your device with the checked options continuously. It
is a useful feature for users who like to program devices in volume quantities.
The user does not have to set the fuses or security modes for every
programming.
CAUTION: Some devices, such as Philips P89C52, can pass the BLANK
CHECK routine after they are secured. Securing a device separates the
programmed data pattern from unauthorized access. This command appears
only when the selected device supports it. Some Microcontroller’s and PLDs
can be secured by programming a special address location. The security bit
will be cleared when the device is erased. Once a device is secured, it cannot
be unsecured to read, verify, or duplicate. Also the secured device is seen as a
blank chip even though it is not actually blank.
Device / Encryption
The encryption table is a feature of the 87C51/87C52 family Microcontroller
devices. The Encryption array of the Microcontroller is initially unprogrammed
(all '1's). In order to protect the code from being easily read by anyone other
than the programmer, this feature allows you to program the encryption table
that is exclusive NO Read with the program code data as it is read out. You
have to know its content in order to correctly decode the program code data.
Thereafter you will have to use the same displayed encryption array any time
you need to read back the device.
Device / Option
In most Microcontrollers, there are several option bits (or fuses) in order to
secure Microcontroller devices. Customer should understand how to set these
bit (fuses) after reviewing data sheet. This option fuses can be either loaded
though a file or entered by manually.