... PX.Y,TARGET JBC P1.1,TARGETCPL PX.Y CPL P1.2INC PX INC P1DEC PX DEC P2DJNZ PX.Y,TARGET DJNZ P1,TARGETMOV PX.Y ,C MOV P1.2 ,C CLR PX.Y CLR P2.3SETB PX.Y SETB P2.3Instructions Reading a latch (Read-Modify-Write)Note: ... R5,A ;clear R5ADD A,#79H ;A=0+79H=79H; JNC N_1 ;if CY=0, add next number; INC R5 ;if CY=1, increment R5N_1: ADD A,#0F5H ;A=79+F5=6E and CY=1JNC N_2 ;jump if CY=0INC R5 ;if CY=1,increment ... accessedBACK: MOV A,#55HMOV P1,AACALL DELAYMOV A,#0AAHMOV P1,AACALL DELAYSJMP BACKRewrite the code in a more efficient manner by accessing the port directly without going through the accumulatorBACK:...