hii, I am using simcom300 modem and atmels 8051 micro controller for my project. can you tell me how to interface both using rs232 and program to control modem using at commands.
But that's not an ARM - is it?
So why have you chosen "ARM" as the MCU Architecture/Product (or "Toolchain") for your posts??
"i need instructions commands for ctrl+z and enter"
Do you means the ASCII codes for those characters?
"in both c and asembly language"
Do you really think that ASCII codes are different in 'C' and Assembly?
Think about it: if they were different, how would the SIMCOM300 know whether your program had been written in 'C' and Assembly??