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Settings Associated with AVR and
8051 Microcontrollers
Oscillator frequency
An external oscillator or a functional internal oscillator
must be connected in the course of AVR microcontroller
programming. The frequency setting must match the
frequency at which the device's oscillator is really
running, after eventual dividers. The maximum speed of
communication with the microcontroller then depends on
the frequency of this oscillator.
Faster Programming with Slow Clock
If this option is active, once the device is erased, the
fuses are programmed at the maximum frequency of the
internal oscillator. This allows the programmer to
communicate with the device at a faster speed. At the
end of programming, the required value of the
communication memory including the clock speed is
programmed.
This option has its effect only if the whole device is
programmed.
Inverse Reset
With this option activated, the programmer generates an
inverse reset signal.
This option is appreciated if the application includes a
reset circuit that needs an inverse signal at the input
compared to the output signal sent to the microcontroller,
and if the programmer is connected via this reset circuit.
Write RC osc Adjustment
When this option is set, programmer will write the value
defined in the Configuration window to "RC osc
Adjustment" fuse. When it is not set, the value read from
the device will be written back to the fuse.
HVP
If this option is checked, the programmer uses the “high”
voltage at pin P for communication with the device.
This allows you to program a device with the external
RESET signal switched off.
Settings Associated with I2C
Memory Chips
I2C Bus Speed
Select the maximum possible speed of the I
2
C bus. The
programmer switches on the internal pull-up of 2.4kΩ
while working on the I
2
C bus.
I2C Memory Address
Select the address of the I
2
C memory on the bus.
Settings Associated with SPI Flash
Chips
▸ Start address
Sets the address range for work with the memory. Start
address is the first address, where the selected
operation is executed.
▸ End address
Sets the address range for work with the memory. End
address is the last address, where the selected operation
is executed.
PRESTO Programmer Settings
Window
In idle state
If this option is checked, the programmer supplies power
to the application even when not programming.
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