Page 20
8) PIC24 and dsPIC33 devices may be programmed
using PE (Programming Executive) or using the
standard method. Programming by means of PE is
usually faster.
9) When the MCU debug mode is enabled using a fuse,
the programmer cannot communicate with it.
AVR Microcontrollers
Fig.10: AVR microcontroller
1) A source of the clock signal, which is set in the device
or which will be set by fuses during programming
must be connected to the device. A crystal must be
connected if set up as the clock source.
2) Device fuses have been set up by the producer to the
internal oscillator with a frequency of 1MHz. In the
initial programming, the device should be
programmed with “Oscillator frequency” set up at
“>750kHz” or lower in the “FORTE programmer
settings” window.
3) Not all AVR devices allow use of a crystal
(e.g.ATtiny13, ATtiny15).
4) After the device fuses are correctly set up, right-click
(i.e. using the right mouse button) inside the
Configuration window and choose Learn fuses.
This saves the fuses in the up.ini file or in the project
if used. This is necessary due to the fact that .hex
files for AVR microcontrollers themselves do not
contain configuration fuses. If a device is
programmed from the command line, a .ppr project
file containing saved fuses needs to be used.
5) Ticking the Open file with data memory
automatically option in the File menu loads data
for the data memory simultaneously with the code/
main memory data.
6) Use the EESAVE fuse if preservation of data memory
is required. If the EESAVE is active, choose Program
all except data memory for programming,
otherwise a warning appears at this place (blank
check of data memory).
7) HPRAVR is an optional accessory for programming
AVR microcontrollers in applications with the
ISP10PIN standard connector on the device's side.
8) Some AVR devices have their ISP interface provided
at different pins than the SPI interface. Further
information can be found in the device data sheet (in
the Serial Downloading section).
AVR in HVP mode
Fig.11: AVR in HVP mode (e.g. ATtiny841)
To Next Page
Loading...