ISP question

What is the type of current (VCC or GND) used on the ISP connectors, i mean the MOSI MISO CLK and CS Does any of these can use both current types? Like they can be VCC or GND) in different times?

Thanks

Your question doesn't really make much sense. Current does flow in these signals but it's almost never of any concern to us.

The voltages change a lot and they are important to us, from almost 0v to almost VCC, often they change between the two levels very rapidly, say in the order of 1 million times a second. So yes they can be like "VCC or GND) in different times?"


Rob

ICSP connector does not have CS - it has Reset so that an external programmer can drive it low and program the device.

tsunamy_boy: What is the type of current (VCC or GND) used on the ISP connectors

You're misusing the term "current" in your statement. "VCC Current" and "GND Current" don't really mean anything.

You might want to watch this video, which tries to explain the difference between "Voltage and Current." http://www.youtube.com/watch?v=lYZUXV-v71Y

tsunamy_boy: What is the type of current (VCC or GND) used on the ISP connectors, i mean the MOSI MISO CLK and CS Does any of these can use both current types? Like they can be VCC or GND) in different times?

Thanks

The ICSP pins (when being used by SPI) basically have TTL levels on them. That is, around 4,7 to 4.9 volts logic 1 and 1.0 to 0.3 volts logic 0.