For some ICs(see section 5) which has the block lock/protect feature,
the programmer will enable/disable this feature on those blocks
according to the settings in the PSB byte.
Algorithm/PSB setting
[key1 + key2 + key3]:
For most EPROMs, this command changes the programming
algorithm and the time. Although this is an user accessible feature, we
don't encourage to change it unless the user knows exactly what he is
doing. Instead, we suggest using the default algorithm to program the
device.
For some Flash/Micro ICs, this command become the entrance of the
setting mode for the PSB byte.
For other ICs, this command has no action.
The PSB setting for Memory Protection:
For ICs which has the ability to lock/unlock some of its memory
blocks, preventing data from accidentally lost, the PROM8908 can deal
this feature through the PSB(Protection-Setting-Byte) settings. The user
should pay attention on its value(shown by 2 digits on the lower left
corner of the LCD display in HEX number) because it will influence the
result of how those ICs be Copied and Verified.
When those IC's name was chose, depressing all three keys together
will bring out the PSB value in bit form on the LCD display. The
leftmost bit corresponding to the highest address block of memory and a
"1" means this block is "locked". Use [key1] or [key2] to move the
cursor to the proper bit position and use [key3] to toggle it. After all
bits are setted(all no-use bits should be set to '0'), move the cursor out of
those region and depress [key3] to exit. The new value will be shown on
the display immediately.
5
