Pololu Orangutan USB - Manual (Page 14)

Listed Frequency Actual Frequency Allowed Target Frequency
1.845 MHz 2.5 MHz > 10 MHz
460.8 kHz 1.25 MHz > 5 MHz
115.2 kHz 625 kHz > 2.5 MHz
57.6 kHz 156 kHz > 625 kHz
4.00 kHz 3.91 kHz > 16 kHz
1.21 kHz* 610 Hz* > 2.5 kHz*
* This ISP frequency is so low that AVR Studio times out when it tries to program flash or EEPROM, but it
can be used to program fuses and lock bits.
You should be able to program any device running at 1 MHz or higher using the listed 57.6 kHz setting,
which is the Orangutan USB programmer’s default ISP frequency. An 8 MHz device (e.g. the Orangutan)
can be safely programmed using the 460.8 kHz setting and a 20 MHz device (e.g. the Orangutan SV-xx8,
Orangutan LV-168, Baby Orangutan, and 3pi robot) can be safely programmed using the fastest 1.845 MHz
setting. The two lowest frequencies exist as a safety net in case you accidentally set the clock of your target
device to something under 1 MHz. The 1.21 kHz setting is too slow to actually program your target device
(AVR Studio will time out waiting for a response from your Orangutan), but it will still let you set the
fuses. Be aware that if you attempt to program flash or EEPROM using the 4.00 kHz setting, it might take
somewhere on the order of five to ten minutes depending on the size of your program, so you should only
use this ISP frequency as a last resort.
• Fuses (proceed with caution!)
Clicking on the Fuses tab will cause the programmer to read the fuse settings of the target device. If your
programmer is not connected to your Orangutan when you select this tab, you will get an error message.
Fuses allow you to configure certain aspects of your microcontroller such as boot flash size, brown-out
detection level, and the clock off of which it should run (e.g. external crystal, internal oscillator). To learn
more about the fuses and what they do, please see the ATmega48/88/168/328P datasheet.
Note: You can permanently disable your Orangutan by setting the fuses incorrectly.
Only advanced users who know precisely what they are doing should change these fuse
settings!
• Lock Bits
Clicking on the Lock Bits tab will cause the programmer to read the lock bits settings of the target device. If
your programmer is not connected to your Orangutan when you select this tab, you will get an error message.
The lock bits allow you to secure your microcontroller by preventing further flash writing or reading. The
lock bits can be reset to a fully unlocked state by performing a chip erase (i.e. by clicking the Erase Device
button in the Program tab). Lock bits are usually only important if you wish to release a product to other
people without giving them access to the program it is running, or if you wish to make it slightly more
difficult to overwrite a programmed chip.
• Advanced
You should not need to worry about Oscillator Calibration.
• HW Info
This tab will tell you the hardware and software versions of your Orangutan USB programmer.
Section 5.c
explains how you can configure your programmer to change these version numbers so they will match what
your AVR Studio is expecting.
Pololu Orangutan USB Programmer User's Guide © 2001–2011 Pololu Corporation
5. Getting Started Using Windows Page 14 of 32