Finish the program by writing assembly code to compare x and y. Light up LED if x < y. In order to compare two operands, we need to understand the following instruction, CMP. CMP src, dst V: 1, arithmetic overflow 0, otherwise N: 1, src > dst 0, src <= dst Z: 1, src=dst=0 0, otherwise C: 1, carry from MSB result 0, if not This CMP instruction will set the bits in SR according the relation of the operands. The most relevant results for our comparison purpose are stored in N. When the source is larger, the bit N will be set. There are program flow control instructions such as JZ(JEQ), JNZ (JNE), JC, NC, JN, JGE, JL, and JMP. Since our comparison will result in setting the bit N if the first number is larger, we can only use JN (Note that the N in JNZ, JNE, and JNC, means not). Run your program for the following settings: 1) x = 0x01, y = 0x02 2) x = 0x02, y = 0x02 3) x = 0x03, y = 0x02

----------------------------------------- this what i have so far:

#include "msp430.h" ; #define controlled include file

NAME main ; module name

PUBLIC main ; make the main label vissible ; outside this module ORG 0FFFEh DC16 init ; set reset vector to 'init' label

RSEG CSTACK ; pre-declaration of segment RSEG DATA16_HEAP ; start the heap segment z DW 1234h ; place a variable as a tag RSEG DATA16_N ; start data segment x DW 01h ; define global variable x y DW 02h ;define global variable y RSEG CODE ; place program in 'CODE' segment

init: MOV #SFE(CSTACK), SP ; set up stack main: NOP ; main program // MOV.W #WDTPW+WDTHOLD,&WDTCTL ; Stop watchdog timer CMP.b x, y JN skip skip: BIS.B #01h, P1OUT ; Toggle Red LED on MSP430F

push #1234 JMP $ ; jump to current location '$' ; (endless loop) END