However, in most of the cases, there is usually no sane reason to use a dumb microcontroller for your computing needs (an Attiny45, for example), and put another (more equipped) microcontroller in front of the other to provide the USB interface. Also, given the large offer of microcontrollers on the market, you can probably find a solution with a microcontroller with a lower price tag. What you gain by using a microcontroller is that you have much more freedom, as you're not bound by the limitations of the hardcoded firmware. What you gain by using an application-specific IC is that you don't have to write the firmware for the IC yourself. These two are pretty much the same, within an FT232 you would most probably find a microcontroller with a hardware USB-interface. You could build a not-so-simple circuit, which would involve either an application-specific integrated circuit, like the FT232 or his cousins (MCP2200, PL2303, CH341, etc), or a microcontroller with a hardware USB-interface integrated. In short: it's not possible to build a simple circuit to do that. So is it possible to build a simple circuit that does what the FTDI is
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