different Programming ways in making a evaluation board

[oister]

While making a evaluation board using 89s51 and avr our instructor mentioned three ways which are

Off the board program,ISP (In System Programming),JTAG

I am aware of ISP that a programmer can change the code while mcu residing in the board but i could not completely understand the off the board program and JTAG???


I googled it but could not find what are the advantages and disadvantages of these too so we use mostly use ISP.

So anyone who can highlight it a bit more thanks.

 

[chathusrilanka]

Off the Board - This is just the conventional program mechanism. You just remove the device from the board and attach it to a programmer to get it programmed.

Advantages - Simple, No need to much complex tools to program

Disadvantages - Need to remove the device from board. (Higher downtime), No Debugging is possible.

 

[oister]

Thanks i donated you points.