The document discusses different instruction groups for the 8085 microprocessor including: data transfer instructions like LDAX and STAX which move data between registers and memory, arithmetic instructions like ADD and INR which perform addition and increment operations, and branching instructions. It provides examples of instructions and describes their length, function, and effect on flags and processing time.

1. CHAPTER 4 SECTION 4.8 Instruction set 8085

2. DATA TRANSFER GROUP INSTRUCTION. ARITHMETIC GROUP INSTRUCTION. LOGICAL GROUP INSTRUCTION. BRANCHING GROUP INSTRUCTION. Classification of instruction set:

3. 1 BYTE INSTRUCTION: MOV C,A ADD B 2 BYTE INSTRUCTION: MVI A, 8-bit data OUT 8-bit address 3 BYTE INSTRUCTION LDA 2050 STAX H Length of Instructions:

4. SOURCE TO DESTINATION LENGTH OF INSTRUCTION EXAMPLES: LDAX Rp STAX Rp LXI Rp, 16 bit immediate data Data transfer group:

5. LENGTH OF INSTRUCTION FUNCTION FLAGS AFFECTED T-STATE LDAX Rp

6. LDAX B Before execution A 00 B 20 C 01 D E H L 2000 2001 50 2002

7. LDAX B After execution A 50 B 20 C 01 D E H L 2000 2001 50 2002

8. LENGTH OF INSTRUCTION FUNCTION FLAGS AFFECTED T-STATE STAX Rp

9. STAX D Before execution A 20 B C D 25 E 05 H L 2504 2505 10 2506

10. STAX D After execution A 20 B C D 25 E 05 H L 2504 2505 20 2506

11. LENGTH OF INSTRUCTION FUNCTION FLAGS AFFECTED T-STATE LXI Rp, 16 bit immediate data

12. LXI B, 1507H Before execution A B 00 C 00 D E H L 2504 2505 2506

13. LXI B, 1507H After execution A B 15 C 07 D E H L 2504 2505 2506

14. PERFORMS ARITHMETIC OPERATIONS. LENGTH OF INSTRUCTION. EXAMPLES: ADD Rs INR R DCR R Arithmetic group

15. LENGTH OF INSTRUCTION FUNCTION FLAGS AFFECTED T-STATE ADD Rs

16. ADD B Before execution A 93 B B C 7 D E H L 2504 2505 2506

17. ADD B After execution A 4A B B C 7 D E H L 2504 2505 2506

18. Procedure

19. LENGTH OF INSTRUCTION FUNCTION FLAGS AFFECTED T-STATE INR R

20. INR R Before execution A 93 B C D B E 7 H L 2504 2505 2506