Below are portions of a UST file: 147 COCO4A F2E040002100 xor.b #LEDZGRN,&P1OUT 14800C050 need a delay so we can actually see the LED blink 149 000050 B0126ECO call #Delay_long 150 00C054 F2E040002100 xorb #LEDZGRN,&PLOUT : >>>> 188 00006E Delay_long 189 00C06E OF12 push R15 save R15 since we use it here 190 000070 DelayTopl 191 000070 3F43 m ov #LONG DELAY, R15;load loop counter 192 000072 Loopilong 193 00C072 1783 dec R15 decrement loop counter 194 00C074 FE23 jnz Loopllong Zero yet?, no, dec again 196 000076 3F41 Pop R15 : restore R15 before returning 197 000078 3041 ret ; return >>>> 219 OOCO7A Port1_ISR 220 00C07A If we get to here, an interrupt occurred on the Port 1 221 OOCO7A F2822300 bitb #PUSHBUTTON, PLIFG was it the Pushbutton 222 OOCOTE 0424 jeg Done here :no, so don't do anything 223 OOCOBO D2E30002 xorb #1. & Pattern State Flag yes, toggle the flag 224 COCO84 C2432300 clr.b&PLIFG ; clear the flag 225 OOCOB8 Done_here 226 000088 0013 reti ;return from interrupt 227 OOCOSA 228 OOCOSA : end of Port1 ISR >>>> 188 00006E Delay_long 189 00C06E OF12 push R15 save R15 since we use it here 190 000070 DelayTopl 191 000070 3F43 m ov #LONG DELAY, R15;load loop counter 192 000072 Loopilong 193 00C072 1783 dec R15 decrement loop counter 194 00C074 FE23 jnz Loopllong Zero yet?, no, dec again 196 000076 3F41 Pop R15 : restore R15 before returning 197 000078 3041 ret ; return >>>> 219 OOCO7A Port1_ISR 220 00C07A If we get to here, an interrupt occurred on the Port 1 221 OOCO7A F2822300 bitb #PUSHBUTTON, PLIFG was it the Pushbutton 222 OOCOTE 0424 jeg Done here :no, so don't do anything 223 OOCOBO D2E30002 xorb #1. & Pattern State Flag yes, toggle the flag 224 COCO84 C2432300 clr.b&PLIFG ; clear the flag 225 OOCOB8 Done_here 226 000088 0013 reti ;return from interrupt 227 OOCOSA 228 OOCOSA : end of Port1 ISR