High-performance, Low-power AVR? Operating Voltages — 2. It should be soldered or glued to the PCB to ensure good mechanical stability. If the center pad is left unconneted, the package might loosen from the PCB. By executing powerful instructions in a single clock cycle, the ATmega8 achieves throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize power consumption versus processing speed.
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In this part we will add the ATmega8 microcontroller and an interface to allow it to be programmed. You could also build this circuit using an ATmega48, 88, or as these all share the same pin layout but have slightly different features, clock speeds and memory.
When you look at the microcontroller you will see a few makings which help identify the pin numbers. This denotes the top of the IC Integrated Circuit. Additionally, on the ATmega8 there is a small circle identifying pin 1. In some cases e. You will need to bend the pins inwards slightly.
One method is to insert one side of the IC in shallowly then bend the pins on the other side so that they fit into the tie points on that side.
Now we will supply power to the IC. The figure below shows these connected up. This notation is quite common and means the function is activated when the pin is grounded. We will build a circuit consisting or a 10k; resistor and a push button switch. The switch we are using is a micro tactile switch. These switches have 2 pairs of pins, with the pins in each pair connected to each other. This is shown in the diagrams below.
You will find it useful to straighten the pins on the micro tactile switch prior to inserting it onto the breadboard. Now we just need to build the circuit onto the board. These connectors do not fit onto a breadboard because the rows are 0. We need the rows to be 0. There are many solutions to this problem. We will be bending the pins on a IDC connector with Right angle leads. This may not look pretty, but it works. Lastly we insert the IDC connector then wire it up to 5V supply, ground and the microcontroller.
Care must be taken when inserting the IDC connector, as the pins are a bit thicker that the wires you would normally insert into a breadboard.
ATmega8 breadboard circuit – Part 2 of 3 – The Microcontroller