Software Front-end
4-4 AVR
®
In System Programmer User Guide
current fuse setting to the device. Checking one of these check-boxes indicates that this
fuse should be enabled/programmed, which means writing a “zero” to the fuse location
in the actual device. Note that the selected fuse setting is not affected by erasing the
device with a chip-erase cycle (i.e., pressing “Chip Erase” button in the “Program”
settings).
Detailed information on which fuses are available in the different programming modes
and their functions can be found in the appropriate device datasheet. By checking the
“Auto Verify” check box, a verification will be automatically preformed after each
programming.
Please see the “Special Considerations” in Section 6 if you plan to change the RST-
DISBL or SPIEN fuse.
Figure 4-3. Fuses Settings
Table 4-1. Check Box Description
Icon Description
Unprogrammed fuse or lockbit
Programmed fuse or lockbit
Readback of current state is impossible, but fuse or lock can be programmed. Set to be
programmed.
Readback of current state is impossible, but fuse or lock can be programmed. Not set to
be programmed.
Readback of current value indicated unprogrammed lock or fuse bit, but no access is
possible. (I.e., can not be changed in serial mode.)
Readback of current value indicated programmed lock or fuse bit, but no access is
possible. (I.e., cannot be changed in serial mode.)
Fuse or lock bit is not accessible, and read back is impossible.
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