Arithmetic Group of Instructions

By
1. ADD
2. ADI
3. ADC
4. ACI

5. SUB
6. SUI
7. SBB
8. SBI

9. INR
10. DCR
11. INX
12. DCX

13. DAD
14. DAA

Comments

Post a Comment

Popular posts from this blog

SUB

By
Syntax: SUB R Where R can be any of the general purpose registers (A,B,C,D,E,H andL) Byte: 1byte Addressing Mode: Register   Addressing Working:  1.  2.  3.  4. Flag Example: SUB B   where  [B] = 11H  and [A]= 22H After execution of  SUB  B [A] = 11H  [B] = 22H Program: write an ALP for 8bit subtraction  of values present in Registers A and B where A carries 44H and B carries 30H. Store result at memory location 5000H. Label  Mnemonics  Comments Start: SUB B            STA 5000H   Stop: HLT Output: [5000H]= 14H LXI H, 4000H ;  4000= 90h MOV A,M ; a = 90h INX H ;  4001h where 4001= 40h MOV B, M ; b= 4 0h SUB B ; a = a - b ... A = 90 - 40= 50h INX H ;  4002h MOV M,A ;  4002h = 50h HLT            
Read more

Microprocessor 8085 Instructions

By
Image
Instructions of 8085 can be classified on three basis:  First Classification on basis of their byte length i.e. size of instruction. 1.  1-byte instructions 2. 2-byte instructions 3.  3-byte instructions Second Classification on basis of their addressing modes i.e. kinds of approaches to fetch and execute. 1. Register Addressing 2. Immediate Addressing 3. Direct Addressing 4. Register Indirect Addressing 5. Implicit Addressing There are five sets of instructions for 8085mp  Programming:  1. Data Transfer group 2. Arithmetic group 3. Logical group 4. Branching group 5. Machine Control group
Read more

DCX

By
  Syntax: DCX Rhp Where Rhp is the higher order register of the pair BC or DE or HL. Byte: 1byte Addressing Mode: Register   Addressing Working:  1.  2.  3.  4. Flag Example:  1. DCX H Where [HL]= 1000H....[H]= 10, [L]= 00 After execution of DCX H  [HL]= 0FFF H 2. DCX B Where [ BC] = 1055 H After execution of DCX B [ BC]= 1054 H
Read more