Problem1.1: Based on function, 8051 has how many types of instructions and what are the functions? Problem1.2: Judge whether the instructions shown below are correct or not? MOVC A, @PC+AADD A DPTR CPL R5 DEC DPTR PUSH PC CLR R1 SWAP E MOV f0, Acc.3 MOVX A.@R2 Problem1.3: For what are the elements to form an 8051 instruction? What are the elements to form an assembly instruction? Problem1.4: Initially PSW-00H, after execution of the following code, what is the value in the PSW register (how C, AC, Ov, P changed)? MOV A, ADD A, SUBB A, #5CH #9AH #70H