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16
PicTools Manual 3.0
QuickWriter identifies each set of bits by labels provided in the manufacturers datasheet. If you are
not familiar with a particular reference, such as WDT (Watch Dog Timer), you will need to see the
datasheet which will give a full explanation of the configuration option and its meaning. Do not
change the configuration word unless you are fully aware of each options function. Selecting the
wrong configuration can make the MCU operation undesirable or unreliable, which renders the
device unusable.
Details
Select "Edit - Configuration Word". To change FUSES in the configuration word, use the selection
arrow beside each Fuse option to select from its available settings (or use the TAB and CURSOR
keys).
WARN if Code Protection Enabled - If selected and one of the Configuration Fuses indicate that
the Code or Data Protection fuse(s) have been enabled, you will be presented with three
options before programming the MCU.
This warning will help remind you that the protection fuses are about to be enabled.
Once the Code or Data protection fuses have been enabled on a device, the contents of the
protected section is no longer accessible for READING or VERIFYING.
NOTE: Code Protection will prevent erasing on most JW (Windowed, eraseble) devices.
If setting the Protection fuse was unintentional, then select NO to have QuickWriter
automatically disable the Protection and continue with the operation in progress. Otherwise
choose YES to continue "AS IS" or CANCEL to completely abort the operation.
NOTE: Each MCU has different Configuration options. If the MCU type is changed,
you will need to review changes in the Configuration Word options before
programming the MCU.
(see also: Setting HEX Options
9
)
Special Consideration
Some PICmicro MCUs have Fuse options to "turn off" the external MCLR signal and others may
have options to set the Oscillator to "internal". On older MCUs with these options and a "Power
First" requirement of VDD (such as the 12C508/12C509), QuickWriter may have problems re-
programming or reading the contents once the fuses have been programmed. This normally does
not become an issue since the devices are OTP (one time programmable).
Newer MCUs with these fuse options allow a "Power first" of VPP (programming Voltage), which
ensures the device can re-enter programming mode and be read after the fuses have been
programmed.
? 2007 TechTools
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