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	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

Chandu yadav

Updated on 30-Jul-2019 22:30:26

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