Instruction Set of 8085 An instruction is a

Instruction Set of 8085 An instruction is a command given to computer to perform specified operation on given data 11/3/2020 Lecturer: Mrs Charulata Ingle 1

Classification of instructions o Data transfer group o Arithmetic group o Logical group o Branch control group o I/O and machine control group 11/3/2020 Lecturer: Mrs Charulata Ingle 2

Data Transfer Group Ø Instruction which are used to transfer the data from one register to another register, from memory to register or from register to memory. Ø When an instruction of data transfer is executed , data is transferred from source to destination without altering the contents of source. Ø Examples: MOV, MVI, LXI, LDA, STA 11/3/2020 Lecturer: Mrs Charulata Ingle 3

DATA TRANSFER GROUP Instruction Description Example States Flags Addressing Machine Cycle MOV r 1, r 2 Move the contents of r 2 to r 1 MOV A, B 4 None Register 1 MOV r, M Move the contents of memory to register LXI H, 2000 H MOV A, M HLT 7 None Register indirect 2 MOV M, r Move the contents of register to memory MOV M , C 7 None Register indirect 2 MVI R, data Move immediate data to register MVI A, 05 7 None Immediate 2 MVI M, data Move immediate data to memory LXI H, 2000 H MVI M, 08 HLT 10 None Immediate/register 3 Contd…

DATA TRANSFER GROUP Instruction Description Example States Flags Addressing Machine Cycle LXI rp, data 16 Load register pair immediately LXI H, 2500 H 10 None Immediate 3 LDA addr Load accumulator direct LDA 2500 H 13 None Direct 4 STA addr Store accumulator direct STA 2000 H 13 None Direct 4 LHLD addr Load H-L pair direct Addr to L Addr +1 to H LHLD 2500 H 16 None Direct 5 SHLD addr Store H-L pair direct L to addr H to addr+1 SHLD 2500 H 16 None Direct 5 Contd…