Develop an assembly program to find the sum of first 'n' natural numbers and store the result in memory in both Big-endian and Little-endian format. If the result goes beyond 16 bits, the result should be stored in the memory. (Use Thumb mode only) Develop an assembly language program to generate symmetric and asymmetric square wave on 'PORT 0' second pin and third pin. The time period of the wave should be 2 msec.