8085 program to reverse 8 bit number

In this program we will see how to reverse the digits of an 8-bit number using 8085.

Problem Statement

Write 8085 Assembly language program to reverse an 8-bit number stored at location 8000H. Also, store the result at 8050H.

Discussion

Here the task is too simple. There are some rotating instructions in 8085. The RRC, RLC are used to rotate the Accumulator content to the right and left respectively without carry. We can use either RRC or RLC to perform this task.

Input

Address	Data
…	…
8000	4C
…	…

Flow Diagram

Program

Address	HEX Codes	Mnemonics	Comments
F000	3A, 00, 80	LDA 8000H	Take the number from memory
F003	0F	RRC	Rotate right without carry four times
F004	0F	RRC
F005	0F	RRC
F006	0F	RRC
F007	32, 50, 80	STA 8050H	Store the result at memory
F00A	76	HLT	Terminate the program