Insert the carriage return character in Vim

I'm editing a network protocol frame stored in a file in Unix (\n newlines). I need to insert the carriage return character (U+000D also known as \r or ^M). When I try to paste it from the clipboard ("+p) or type it using Ctrl+Shift+u开发者_Go百科-000d, the linefeed is inserted (U+000A).

What is the right way to do it?

Type: ctrl-v ctrl-m

On Windows Use: ctrl-q ctrl-m

Ctrl-V tells vi that the next character typed should be inserted literally and ctrl-m is the keystroke for a carriage return.