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Note that ATmega644 firmware for communicating with the DB101 is not included in
the firmware distributed with this application note. Please refer to the DB101
documentation for more information about the DB101 connectors.
4.5 Programming and debugging headers
The ATtinyx61 and ATtinyx5 can be ISP programmed through their respective
ISP/dW 6 pin headers (2.54mm). The same connectors can be used for debugging
using DebugWire. Please refer to Figure 4-1 (below) to identify the programming and
debugging pin headers.
Note that, to be able to run DebugWire debugging it is required to disconnect the
ATtiny reset circuit (pull-up, decoupling and clamping diode), otherwise the
DebugWire communicate will fail. For the ATtinyx5 devices the resistor R302 must be
removed to disconnect the reset circuit. For the ATtinyx61 the resistor R303 should
be removed.
The board controller (also referred to as “master”) can be programmed and debugged
through either ISP or JTAG. The device’s RESET lines are connected individually.
Figure 4-1. Programming and debugging headers.
ATtinyx5 ISP and
DebugWire header
ATtinyx61 ISP and
DebugWire header
ATmega644 JTAG header
ATmega644
ISP header
Note that the three AVRs on the board share the SPI programming lines for
communication purposes: if one device is driving the SPI lines while SPI
programming of the other device is attempted the programming is likely to fail.
Therefore, ensure that no devices are driving the shared SPI programming lines while
SPI programming is performed. If JTAG programming is used to program the
8
AVR451
8088A-AVR-09/07
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