USBtinyISP
USBtinyISP with jumper removed
The Arduino IDE knows this programmer as USBtinyUSB.
Supply voltage
If the target is a 3.3V device, it would be best to use a 3.3V compatible programmer, too. The USBtinyISP (since version 2) makes use of 3-state buffers for the signal lines, and has a jumper that can be removed to disconnect the 5V from the USB port from the target.
Using the programmer
AVRDUDE is a very popular command-line program for programming AVR chips. Avrdude version 5.5 and higher has built-in support for USBtinyISP!
https://learn.adafruit.com/usbtinyisp/avrdude
The tool avrdude knows this programmer as usbtiny.
See for a successful use of this programmer: BackDoorSensor.
How to use avrdude:
Usage: avrdude [options]
Options:
-p <partno> Required. Specify AVR device.
-b <baudrate> Override RS-232 baud rate.
-B <bitclock> Specify JTAG/STK500v2 bit clock period (us).
-C <config-file> Specify location of configuration file.
-c <programmer> Specify programmer type.
-D Disable auto erase for flash memory
-i <delay> ISP Clock Delay [in microseconds]
-P <port> Specify connection port.
-F Override invalid signature check.
-e Perform a chip erase.
-O Perform RC oscillator calibration (see AVR053).
-U <memtype>:r|w|v:<filename>[:format]
Memory operation specification.
Multiple -U options are allowed, each request
is performed in the order specified.
-n Do not write anything to the device.
-V Do not verify.
-u Disable safemode, default when running from a script.
-s Silent safemode operation, will not ask you if
fuses should be changed back.
-t Enter terminal mode.
-E <exitspec>[,<exitspec>] List programmer exit specifications.
-x <extended_param> Pass <extended_param> to programmer.
-y Count # erase cycles in EEPROM.
-Y <number> Initialize erase cycle # in EEPROM.
-v Verbose output. -v -v for more.
-q Quell progress output. -q -q for less.
-l logfile Use logfile rather than stderr for diagnostics.
-? Display this usage.
avrdude version 6.3, URL: <http://savannah.nongnu.org/projects/avrdude/>
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