May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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6.4 | NOP Instruction
NOP is an instruction that is generally used for fi ne-tuning the delay loops. is 1-byte one-cycle instruction
does not do anything except killing time of the processor. We will use this instruction as an idle (or fi ller)
instruction in Chapter 12.
6.5 | Solved Examples
Example 6.1
Purpose: To be familiar with indirect addressing and controlling any program loop using DJNZ instruction.
Problem
Write a program to clear lower 128 bytes of internal RAM.
Solution
In this case, we may select bank #0 and use register R0 as a pointer. e program may be written as follows:
START: MOV A, #00H ; clear accumulator
MOV PSW, A ; select bank #0
MOV R0, #7FH ; load pointer with highest address
CLEAR: MOV @R0, A
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