Logical Instructions of 8051 Microcontroller | AND | OR | XOR | CPL | SWAP | Instructions of 8051
Summary
TLDRThis educational video delves into the logical instructions of the microcontroller 8051, focusing on operations such as AND, OR, XOR, complement, and swap. The instructor provides syntax and examples for each instruction, demonstrating how they can be applied with the accumulator, direct data, and internal RAM addresses. Additionally, the video covers special operations like CPL for NOT, and NOP for delay, offering a comprehensive guide for those looking to understand or program with the 8051 microcontroller.
Takeaways
- 😀 The video is part of a lecture series on the microcontroller 8051, focusing on logical instructions.
- 🔍 It covers various logical operations including AND, OR, XOR, and complement/swap instructions.
- 📘 The 'AND' operation is performed using the 'ANL' instruction, which can be between the accumulator and a register, direct data, or a memory location.
- 🔄 The 'OR' operation is executed with the 'ORL' instruction, similarly involving the accumulator and different data sources.
- 🔢 The 'XOR' operation is done using 'XRL', which also compares the accumulator with various data types and locations.
- 🔁 The 'CPL' instruction is used to perform the NOT operation, which can be combined with other operations to form NAND, NOR, and XNOR.
- ❌ The 'CLR' instruction clears the accumulator, setting it to 0x00.
- 🔄 The 'SWAP' instruction swaps the lower and higher nibbles of the accumulator.
- 🕒 The 'NOP' (No Operation) instruction is used to generate a delay without performing any operation.
- 📝 The video provides examples for each instruction to help understand their application in programming.
- 👨🏫 The instructor encourages students to ask questions in the comment box for further clarification.
Q & A
What is the purpose of the video lecture series on the microcontroller 8051?
-The purpose of the video lecture series is to explain the logical instructions of the microcontroller 8051, providing examples to help viewers understand how to use these instructions in programming.
What are the types of logical instructions covered in the video?
-The video covers logical AND (ANL), logical OR (ORL), logical XOR (XRL), complement (CPL), swap (SWAP), and no operation (NOP) instructions.
What does the ANL instruction do in the 8051 microcontroller?
-The ANL instruction performs a logical AND operation between two eight-bit numbers and stores the result in the accumulator A.
Can you provide an example of how to use the ANL instruction with direct data?
-An example of using ANL with direct data is 'ANL A, #50H', which performs a logical AND operation between the accumulator A and the value 50H, storing the result in A.
How does the ORL instruction differ from the ANL instruction?
-The ORL instruction performs a logical OR operation between two eight-bit numbers instead of an AND operation, and the result is stored in the accumulator A.
What is the syntax for the ORL instruction when using it with a memory location?
-The syntax for the ORL instruction with a memory location is 'ORL A, @R1', where R1 points to a memory location in internal RAM, and the data at that location is logically ORed with A.
What does the XRL instruction perform, and how is it different from ANL and ORL?
-The XRL instruction performs a logical XOR operation between two eight-bit numbers. Unlike ANL and ORL, which perform AND and OR operations respectively, XRL results in a value that has bits set to 1 only where the two operands have different bits.
Can you explain the CPL instruction and its use in logical operations?
-The CPL instruction performs a NOT operation on the accumulator A, inverting all its bits. It can be used in combination with other logical instructions to achieve NAND, NOR, and XNOR operations.
What is the function of the SWAP instruction in the 8051 microcontroller?
-The SWAP instruction is used to swap the lower nibble and the higher nibble of the accumulator A, effectively reversing the order of the four bits in each nibble.
What does the NOP instruction do, and why might it be used in programming?
-The NOP (No Operation) instruction does not perform any operation. It is used to generate a delay or to align timing in the program execution without affecting the processor state.
How can the CLR instruction be used in programming with the 8051 microcontroller?
-The CLR instruction is used to clear the accumulator A, setting it to 00H. This can be useful for resetting the accumulator to a known state before further operations.
Outlines
🤖 Introduction to 8051 Microcontroller Logical Instructions
This paragraph introduces the video lecture series on the 8051 microcontroller, focusing on logical instructions. The instructor promises to explain various logical operations such as AND, OR, XOR, complement, and swap, using examples to clarify their application in programming. The explanation includes how to perform these operations between the accumulator and various data sources like direct data, internal RAM addresses, and register contents. The paragraph sets the stage for a detailed exploration of logical instructions in the 8051 microcontroller.
🔍 Deep Dive into 8051 Logical Operations and Special Instructions
The second paragraph delves deeper into the specifics of logical operations in the 8051 microcontroller, including the syntax and application of AND, OR, and XOR operations with accumulator, registers, and memory locations. It also introduces the CPL (complement) and SWAP (swap nibbles) instructions, explaining how they can be used to create additional logical operations like NAND, NOR, and XNOR. The paragraph concludes with the explanation of the CLR (clear accumulator) and NOP (no operation) instructions, emphasizing their unique roles in programming. The summary highlights the comprehensive coverage of logical instructions and their practical implications in microcontroller programming.
Mindmap
Keywords
💡Microcontroller 8051
💡Logical Instructions
💡AND Operation
💡OR Operation
💡XOR Operation
💡Complement
💡Swap
💡NOP Operation
💡Accumulator
💡Internal RAM
💡Instruction Syntax
Highlights
Introduction to the microcontroller 8051 and its logical instructions.
Explanation of logic AND operation with syntax 'ANL' between two eight-bit numbers.
Demonstration of logic AND operation using accumulator, register, and direct data.
Use of internal RAM addresses with logic AND operation.
Clarification on the difference between direct data and memory location in logic AND operations.
Introduction to logic OR operation with syntax 'ORL'.
Examples of logic OR operation with accumulator, register, and memory location.
Explanation of logic XOR operation with syntax 'XRL'.
Illustration of logic XOR with accumulator, register, and internal RAM location.
Use of CPL instruction for NOT operation on accumulator.
Application of CPL for achieving NAND, NOR, and XNOR operations.
Description of CLR instruction for clearing the accumulator.
Explanation of the SWAP instruction for swapping nibbles within the accumulator.
Introduction of the NOP instruction for generating delay without performing any operation.
Emphasis on the importance of understanding logical instructions for programming with 8051.
Invitation for viewers to ask questions and seek clarification in the comments section.
Transcripts
welcome to engineering Funda family this
video is a part of microcontroller 8051
video lecture series and in this video
I'll be going to explain you all the
logical instructions of microcontroller
8051 with 8051 we have logic and logic
or logic xor as well as complement and
swap instructions I'll explain you all
the instructions along with example so
that you will be having fair enough idea
about how we can use all these
instructions in programming let us see
all those instructions one by one along
with examples so Here My Dear students
I'll explain you first how logic and
instructions are there with 8051
for logic and operation syntax is a and
l
it will perform logic and operation in
between two eight bits numbers
let me explain you this by for some
examples like when you write a and L
then a comma has 50 H what you do is you
perform logic and operation of a with
Phi 0 h
and answer will get stored inside
accumulator a
when you execute a and l a comma R1 then
you will be performing logic and
operation in between a and R1 and answer
will get stored inside a
when you execute a and l a comma 1 7 H
at the time here You observe my dear
students you are not writing hash
here you are writing hash what it means
50 H is getting ended with a n answer
was getting stored inside a here we are
not writing hash what it means this 1 7
H is memory location with internal Ram
so at that location whatever data is
there that we are ending with a and
answer is getting stored inside a
when you execute a and l a comma at the
rate R1 what you do is here at the rate
R1 means here R1 is pointing RAM memory
location
and at that location whatever data is
that that is getting logic ended with a
and answer is getting stored inside a
so Here My Dear students you should know
how to use internal Ram here by directly
writing address of internal Ram we can
perform this ANL as well as by using
resistor as well we can have usage of
internal Ram in which you will have to
use at the rate symbol
now my dear students if you execute A
and L 2 Phi H comma a in that case you
see here you are performing logic and
operation of a with internal Rams memory
location 25 hex
and that is getting stored inside
25 hex internal memory location
so when you have 2 Phi H directly
written in instruction what it means
this is internal Rams memory location at
that location whatever data is there
that you are doing in terms of logic and
width accumulator a and here first I am
writing 2 Phi H what it means at this
location only we need to store our
answer
my dear students when you execute A and
L 2 Phi H comma has 50 h
so in that case you will be performing
logic and operation of 50 H with memory
location pointed by 2 Phi H in internal
RAM and answer is getting stored at 2
Phi H internal Rams memory location
when we talk about logic or operations
for that my dear students basic syntax
is o r l
here you will be performing two bits
numbers logic or operation
for example when you write orl a comma 5
0 H in that case Phi zero is getting
logic or with accumulator an answer is
getting stored inside a
R1 will perform logic or operation of a
with R1 and answer is getting stored
inside a
when you execute orl a comma 1 7 as here
we are not writing hash what it means
this is my memory location in internal
Ram
so at this location whatever data is
there that is getting logic or with a
and answer is getting stored in a
when you execute Orla comma at the rate
R1 at that time R1 is pointing internal
srams address
and at that address whatever data is
there that is getting logic or with a an
answer is getting stored inside a
here also my dear students when you
write orl
a 25 H comma a then here 25 H that is
Rams internals memory location
and at that location whatever data is
there that is getting logic or with a
and answer is getting stored at this
location right
when you execute orl 25 H comma hash 50
H in that case immediately this 50h data
is getting logic or with the memory
location pointed by 25 h
in internal memory location of Ram and
answer is getting stored over here
so Here My Dear students logic and and
logic are operation that we can perform
as per accumulator with resistor
accumulator with direct data accumulator
with Rams address accumulator with data
pointed by resistor inside internal Ram
right so that is how we can use this now
my dear students I'll explain you logic
xor instructions
here for logic xor you should know
syntax is xrl that will perform logic
xor operation in between two eight bits
numbers
let me give you some examples for
example when you execute xrl a comma
hash 50 H what it means you will be
performing logic xor operation of 50h
with accumulator and answer is getting
stored inside a
when you execute xrl a comma R1 you'll
be performing logic xor operation of a
and R1 and answer is getting stored
inside a when you execute xrl a comma 1
7 x what you do is here you see we are
not writing hash what it means this is
internal Rams memory location so 1 7
hacks that is internal Rams memory
location at that location whatever data
is there that is getting xor with a and
answer is getting stored inside a when
you execute xrl a comma at the rate R1
at the rate means now R1 is pointing
memory location inside internal Ram
so at that location whatever data is
there that you will be xoring with a and
answer is getting stored inside a when
you execute xrl 2 Phi H comma a what you
do is you perform xor operation of a
with internal Rams location 25 hex and
answer is getting stored over here at
internal Rams address 2 Phi H hex
Here My Dear students when you execute
xrl 2 Phi H comma has 50 H what you do
is you perform logic xor operation of
data pointed by memory location 25 hex
with 50 hex and your answer is getting
stored inside internal Rams address at
25h so that is how logic xor
instructions are available now my dear
students I'll explain you some other
logical instructions like CPL so CPL a
that performs not operation right so you
see once complement of a that is getting
performed once complement means what
logic not operation so CPL can be used
to have some other logical operations
how you see we have logic and logic R
and logic xor so to make an end after
and if you have CPL it will make it to
nand
after or if you use CPL it will make it
to nor and after xor if you execute CPL
means it will make it to X Norm that is
how all the logic operation that we can
have in 8051
when you execute CLR what you do is you
will be clearing accumulator means after
execution of this accumulator will
become 0 0 h
when you execute swap instruction
my dear students here swap a that is
used to swap lower nibble and higher
nibble of accumulator
so here as if you have a is equals to 7
8 H after instruction execution
a will become
eight seven so you see lowering and
upper nibble that we are swapping over
here right
Here My Dear students at last no
operation instruction is there n o p so
this instruction does not do anything
that is just used to generate delay
right so it will not perform any
operation NOP
so my dear students this is how logical
instructions are there with eight zero
five one in which here you should know
for nand nor and xnor after this
instruction you will have to use CPL to
have other logical operation as well so
this is how all the logical instructions
are there still if any confusion is
there just post that in comment box I'll
be happy to help you thank you so much
for watching this video
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