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The document discusses the implementation of time delays in the 8051 microcontroller using internal timers and software-based delay subroutines, highlighting their advantages and disadvantages. It also explains the concepts of modules and module instances in Verilog, emphasizing their differences and providing examples. Additionally, it illustrates data transfer instructions in 8051 assembly language for moving data between registers, memory, and input/output ports.

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RAVITEJA REDDY GOGULADINNE
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22 views3 pages

Sunny 3

The document discusses the implementation of time delays in the 8051 microcontroller using internal timers and software-based delay subroutines, highlighting their advantages and disadvantages. It also explains the concepts of modules and module instances in Verilog, emphasizing their differences and providing examples. Additionally, it illustrates data transfer instructions in 8051 assembly language for moving data between registers, memory, and input/output ports.

Uploaded by

RAVITEJA REDDY GOGULADINNE
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Process of implementing a time delay using both internal timer and a software based

delay subroutine in 8051 compare their advantage and disadvantage

In Verilog, modules and module instances are two related but distinct concepts:

*Modules*

A module is a self-contained block of Verilog code that represents a digital circuit or a


functional block. It is defined using the `module` keyword and has its own set of inputs,
outputs, and internal signals. A module can be thought of as a "black box" that performs a
specific function.

*Module Instances*

A module instance, on the other hand, is a specific instantiation of a module within another
module or a top-level design. It is created by invoking the module name and specifying the
input and output connections. A module instance is essentially a "copy" of the original
module, with its own set of inputs and outputs connected to the surrounding circuitry.

Key differences:

- A module is a definition, while a module instance is an instantiation.

- A module can be instantiated multiple times, creating multiple instances.


- Each module instance has its own set of inputs and outputs, which can be connected
differently.

Example:

```

// Module definition

module adder(a, b, sum);

input a, b;

output sum;
assign sum = a + b;
endmodule

Illustrate with examples how data transfer instructions in 8051 assembly language can
be used to move data between registers , memory and input and output ports

```

Here are some examples of data transfer instructions in 8051 assembly language:

Moving Data between Registers

*Example 1: MOV Instruction*

```

assembly

MOV A, R0 ; Move the contents of R0 to the Accumulator (A)

MOV R1, A ; Move the contents of A to R1


```

*Example 2: XCH Instruction*

```

assembly

XCH A, R2 ; Exchange the contents of A and R2

```

Moving Data between Registers and Memory

*Example 1: MOV Instruction with Indirect Addressing*

```

assembly

MOV A, @R0 ; Move the contents of the memory location pointed to by R0 to A

MOV @R1, A ; Move the contents of A to the memory location pointed to by R1


```
*Example 2: MOVC Instruction*

```

assembly
MOVC A, @A+DPTR ; Move the contents of the memory location pointed to by A and
DPTR to A

```

Moving Data between Registers and Input/Output Ports

*Example 1: MOV Instruction with Port Addressing*

```

assembly

MOV P0, A ; Move the contents of A to Port 0

MOV A, P1 ; Move the contents of Port 1 to A


```

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