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4. (25 points) Write a subroutine Design and write an MSP430 assembly language subroutine i2a s(char "a, int myl) that convertsa 16-bit integer, myl, into a character array with elements corresponding to the hexadecimal representation of the integer. For example, an integer myl-13,486-0x34AE is converted into an array with 4 elements as follows: a[o]-'E' a[1]-'A', a[2]-'4', a[3]-'3'. The main program that calls the subroutine is shown below. Ascii('A')-0x41, ascii('0')-0x30. RESET: mov . w # STACK END , SP ; Initialize stack pointer StopwDT : mov.w #WDTPWIDTHOLD ,6HDTCTL ; Stop watchdog timer ; Main code here sub.w #4,SP mov.w SP, R14 mov.W myI, R4 push.w R14 call add . w #2,SP jmp $ ; allocate space for ascii chars ; R14 points to the allocated area ; integer is passed through R4 ; push the starting address on the stack ; call subroutine ; free space on the stack 12a s lend: myI: .word 0x34AE 4. (25 points) Write a subroutine Design and write an MSP430 assembly language subroutine i2a s(char "a, int myl) that convertsa 16-bit integer, myl, into a character array with elements corresponding to the hexadecimal representation of the integer. For example, an integer myl-13,486-0x34AE is converted into an array with 4 elements as follows: a[o]-'E' a[1]-'A', a[2]-'4', a[3]-'3'. The main program that calls the subroutine is shown below. Ascii('A')-0x41, ascii('0')-0x30. RESET: mov . w # STACK END , SP ; Initialize stack pointer StopwDT : mov.w #WDTPWIDTHOLD ,6HDTCTL ; Stop watchdog timer ; Main code here sub.w #4,SP mov.w SP, R14 mov.W myI, R4 push.w R14 call add . w #2,SP jmp $ ; allocate space for ascii chars ; R14 points to the allocated area ; integer is passed through R4 ; push the starting address on the stack ; call subroutine ; free space on the stack 12a s lend: myI: .word 0x34AE