program ATMEGA2560 (arduino mega) in circuit

[SnakeBite]

Hi,

i designing a PCB that include arduino mega 2560 microcontroller and i'd like to program it in circuit using arduino mega board that the microcontroller on it has been removed. which pins i need to connect to which pins in the arduino board? i do have 5v on my pcb and a local 16MHZ crystal.

thanks
Ido

[retrolefty]

First you have to decide what method you wish to program it in, ICSP or USB serial via a installed bootloader?

[SnakeBite]

I want the simplest way. i don't want to include more circuitry just to connect the mega2560 to exist arduino board (arduino mega) that doesn't have the microcontroller on it (desoldered from the board). how can i connect it?
 

[retrolefty]

I want the simplest way. i don't want to include more circuitry just to connect the mega2560 to exist arduino board (arduino mega) that doesn't have the microcontroller on it (desoldered from the board). how can i connect it?

Ok, lets assume you have a arduino Mega board with it's micro chip removed, and on your 'target' PCB you have a ATmega2560 chip that has the proper arduino bootloader already installed in it. The hook-up would be as follows:

Arduino shield pin name                     ATmega2560 chip pin number on custom PCB

D0 serial rec                                                  2
D1 serial tx                                                    3
GND   (any ground pin)                                   PCB ground
RST   (reset pin)                                             30

 This also assumes your custom PCB supplies the needed +5vdc for it's chip, if not you could also jumper shield 5V pin to the Vcc bus of your PCB if the current requirements are within the USB current limit.

[SnakeBite]

i have 5v on my pcb and also i have 16MHZ crystal.

thanks for your help!