80C51

Implementing Modbus Protocol for Communication Between Microcontrollers and PLCs

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Implementing Modbus Protocol for Communication Between Microcontrollers and PLCs

1. Introduction The HMI (Human-Machine Interface) is increasingly used in industrial automation systems and devices due to its small size, high performance, and strong real-time capabilities. It features various displays such as letters, Chinese characters, graphics, and images, with a simple and user-friendly interface. Equipped with long-lasting membrane button keyboards, it is easy to operate. … Read more

Avoiding Overflow Errors in Keil C51 Large Integer Constants

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Avoiding Overflow Errors in Keil C51 Large Integer Constants

The default integer constant operations in the C51 compiler may lead to overflow errors. To avoid potential calculation errors, the data type of large integers should be specified. Keil C51 is a compiler compatible with ANSI C. The ANSI C standard specifies that the default data types for decimal integer constants are one of int, … Read more

Free Download and Installation Guide for Keil 5 Software

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Free Download and Installation Guide for Keil 5 Software

Click the blue text above to follow us Software Download [Name]:keil5 [Size]: 474MB [Operating System]: 32/64-bit [Installation Environment]: Win7/Win8/Win10 [Download Link]: Follow our public account Then reply in the chat with ‘keil‘ to get the download link. The unzip password is “diannaoDIY” Note case-sensitive Software Introduction: 1. Provides rich library functions and powerful integrated development … Read more

What Are the Types of Memory Areas in Keil C51?

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What Are the Types of Memory Areas in Keil C51?

Click the above “Chuangxue Electronics” to follow for easy learning of electronic knowledge. Chuangxue Electronics Subscription Account Daily updates on technical articles in the electronics industry and the latest news on microcontrollers, making it easy to learn anytime, anywhere. Keil C51 memory areas are divided into two main types: program memory area and data memory … Read more

Basics and Applications of Microcontrollers | 06 Microcontroller Parallel Memory Expansion

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Basics and Applications of Microcontrollers | 06 Microcontroller Parallel Memory Expansion

Click the blue words to follow us 1. Microcontroller Parallel External Expansion System 1. Microcontroller Parallel External Expansion System External expansion is an important aspect of building a microcontroller system, which can be categorized into two types: Memory expansion and I/O expansion; There are two methods for external expansion: parallel expansion and serial expansion. 2. … Read more

What Happens After the Microcontroller Program Ends?

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What Happens After the Microcontroller Program Ends?

For embedded systems, if there is no RTOS running, the main function main() in program development needs to use some mechanism to keep running happily forever, it has no endpoint. If you want to exit from the main function, what happens specifically is determined by the C language compiler used. 1. Introduction to the Problem … Read more

Overview of C51 Language

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Overview of C51 Language

Little Science Station 1. Overview of C51 Language 1) Advantages: C51 is a high-level programming language designed for the 51 microcontroller and is a subset of standard C language. It features strong readability, easy debugging and maintenance, and a small programming workload. It allows direct access to physical addresses, enabling direct operations on hardware and … Read more

Summary of C51 Microcontroller Programming Points

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Summary of C51 Microcontroller Programming Points

Summary of C51 Microcontroller Programming Points 1. Header file: #include (I am using STC 89C54RD+) 2. Pre-definition: sbit LED = P1^0 // Define bit 0 of port P1 as LED Note: The notation “P1^0” is different from A51 (A51 uses P1.0). P1 is a group of ports, and the port number ranges from 0 to … Read more