====Olimex AVR MT128====
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Atmel ATmega128 development board.

Plugging this board into a usbtiny or usbasp connected to a RPi
may crash the Pi due to inrush current. It
is  sensible to utilise a programmer which can disable (or not supply) target power and power this board using  its AC input.
 
===Test===

<code>
avrdude -c usbtiny -p m128

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e9702 (probably m128)

avrdude: safemode: Fuses OK (E:FF, H:09, L:CF)

avrdude done.  Thank you.
</code>

===Pinout===

==JTAG==

__Male socket__
<code>
  1 TCK  2 GND
  3 TDO  4 5V
K 5 TMS  6 RESET
  7 5V   8 NC
  9 TDI 10 GND
</code>

__Female plug__
<code>
  2 GND   1 TCK
  4 5V    3 TDO
  6 RESET 5 TMS K
  8 NC    7 5V
 10 GND   9 TDI
</code>

K=KEY

==ISP==

__Male socket__

<code>
  1 MOSI  2 5V
  3 NC    4 GND
K 5 RST   6 GND
  7 SCK   8 GND
  9 MISO 10 GND
</code>

K=KEY

==RS-232==

__DB9 female socket__

<code>
5 3 3 2 1
 9 8 7 6
</code>

<code>
1 NC
2 TXD
3 RXD
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC
</code>

===Resources===

[[https://www.olimex.com/Products/AVR/Development/AVR-MT128/|Product page]]

[[https://www.olimex.com/Products/AVR/Development/AVR-MT128/resources/AVR-MT128.pdf|User manual]]

[[https://eleccelerator.com/fusecalc/fusecalc.php?chip=atmega128&LOW=CF&HIGH=09&EXTENDED=FF&LOCKBIT=FF|Fuse calculator]]

[[https://ww1.microchip.com/downloads/en/DeviceDoc/doc2467.pdf|ATmega128 datasheet]]