I have made level converter circuit for RS232 to UART using MAX232. But I'm stuck, because I don't know how to send data to MCU. Googling the problem tells me to use hyperterminal but that is not available in Win 8. Please tell me how to do it? I'm using Atmega8 to communicate with PC.
Tera Term is an Open Source alternative to Windows Hyperterm. http://ttssh2.sourceforge.jp/index.html.en
Not sure if it runs on Windows 8 though.
We're big fans of Terminal by Bray, it has many useful features such as being able to display / send data as raw hex (rather than just printable ASCII) and automated challenge/response, plus useful macros.
PuTTY is good as a user interface to something running Linux or similar, but Bray's is better for raw serial comms (non-human readable).