8085 program to separate (or split) a byte into two nibbles

Here we will see how to split two nibbles of an 8-bit number.

Problem Statement

Write 8085 Assembly language program to split two nibbles of an 8-bit number. Number is stored at F050, we will store result at F051 and F052.

Discussion

To get the nibbles separately, at first we are taking number into B register as a copy. Now mask upper nibble to get lower nibble and store it, then take the number from B again, mask lower nibble to get upper nibble, then rotate it four times to make it lower order nibble, after that store it to another location.

Input

Address
 Data
F050
 35

 

Address
 Data
F050
 BE

 

Flow Diagram

 

Program

Address
 HEX Codes
 Labels
 Mnemonics
 Comments
F000
 3A, 50 F0
  
 LDA F050
 Take the number from memory to Accumulator
F003
 47
  
 MOV B,A
 Store the number Acc to B
F004
 E6, 0F
  
 ANI 0F
 AND Acc with 0F to get lower nibble
F006
 32, 52, F0
  
 STA F052
 Store lower nibble to memory
F009
 78
  
 MOV A,B
 Load main number from B to A
F00A
 E6, F0
  
 ANI F0
 AND Acc and F0 to get upper nibble
F00C
 07
  
 RLC
 Rotate Acc to left
F00D
 07
  
 RLC
 Rotate Acc to left
F00E
 07
  
 RLC
 Rotate Acc to left
F00F
 07
  
 RLC
 Rotate Acc to left
F010
 32, 51, F0
  
 STA F051
 Store upper nibble at F051
F013
 76
  
 HLT
 Terminate the program

 

Output

Address
 Data
F051
 03
F052
 05

 

Address
 Data
F051
 0B
F052
 0E

 

 

 

 

 

Updated on: 2019-07-30T22:30:26+05:30

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