Integrating the Hardware You Need Why Would You Want To? Using the ICSP interface to program your Arduino or ATmega328P you can load different Arduino bootloaders or remove them altogether to gain more program space.
#Arduino uno schematics serial
If it sees the correct data it will then load it into its program space.Īrduino Uno In Circuit Serial Programming Interface This bootloader looks for serial data coming over the USB to the serial bridge. Arduino uses the USB interface and a small program that runs at startup on the ATmega328P called the bootloader. ICSP uses external hardware (an ICSP programmer) to communicate to the microcontroller and load compiled code. This is a different way to program the microcontroller than the way Arduino programs. In the case of the Atmel microcontroller (or now Micromel microcontrollers), ICSP stands for In-Circuit Serial Programming also known as ISP. The LM358 (U1A) then drives the gate on the T1 p-channel MOSFET high which closes the MOSFET and prevents back-feeding the USB connector. The voltage divider (RN1B and RN1A) halves the DC power input voltage to greater than or equal to +3.3V. This powers up the LP2985 (U2) to supply the +3.3V DC rail. This reduced voltage then goes into the MC33269 (IC1 or IC2) voltage regulator and applies +5.0V to the power rail. The +7.6V or greater voltage loses 1V due to the diode D1. Arduino Uno Power Path under DC Jack Power
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