A bypass capacitor is connected between pin 16(Vcc) and ground. It uses a charge pump circuit which requires 4 external capacitors to derive the positive and negative voltages from TTL logic level. It can handle maximum input voltage up to ☓0V. This is where the MAX232 IC comes into the picture.Ī MAX232 is a 16 pin IC which consists of 2 drivers and 2 receivers and offers a maximum data rate of 120kbps. So to accomplish the communication between the two devices you need to convert the RS232 level to the TTL logic level and vice-versa. It is generally between ☓V to ☑5V, whereas microcontrollers understand and communicate using TTL logic level which is +5 volts and 0 Volts. up to -25V for logic 0 and up to +25V for logic 1. It is important to note that you will be able to successfully burn the code using this method only if your IC is already bootloaded.īefore proceeding to the actual interfacing, it is important to understand what MAX232 IC is, and what role it plays in programming the microcontroller using RS232 communication protocol.Ĭomputers can communicate serially using the serial port which follows the TIA/EIA-232-F standards (RS232 levels) i.e. However, in this article, I’ll be explaining how you can program your microcontroller using RS232 along with MAX232 IC. You can program it using ISP programmers, USB to TTL converters, RS232 and many more. Though microcontroller programming is easy, there are many ways to do it. In fact, with proper hardware and a few connections, you can easily burn your code and then lay back and watch your microcontroller execute what you desire(obviously not everything :D). Programming a microcontroller is not as difficult as it sounds to most people when they’re just starting out with microcontrollers.
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