The 8051 microcontroller is packaged in 40 pin dual in line package (DIP). Out of 40 pins, 16 pins are single function pins and 24 pins may be used for one or two entirely different function. The pin configuration of 8051 microcontroller is as follows. Figure 1: Pin diagram of 8051 Microcontroller Out of 32 […]
Flags are single bit register and used to store the result of certain function after executing instruction. Flags are grouped inside PSW and PCON registers. PSW register in 8051 microcontroller contains math flags and PCON contains general user flags. Math flags are grouped in PSW of microcontroller 8051 and they are Carry(C), Auxiliary Carry (AC),
PSW Register in 8051 Microcontroller | Program Status Word Read More »
The architecture of 8051 microcontroller can be divided into five main sections: the CPU, the program memory, the data memory, the input/output (I/O) ports and the timer and control unit. CPU: The CPU of the 8051 microcontroller is an 8-bit processor that can execute instructions at a clock speed of up to 12 MHz. The
Depending on operation they perform, instruction set in 8051 microcontroller is divided in several groups, such as: Arithmetic Instructions Branch Instructions Data Transfer Instructions Logic Instructions Bit-oriented Instructions Let’s have a look over instructions in ALP first. Instructions in ALP The first part of each instruction, called MNEMONIC refers to the operation an instruction performs
In this article, we will delve into the various addressing modes in 8051 microcontroller, exploring their functionalities and benefits in the programming. One of the key features of 8051 microcontroller that contribute to its versatility is the wide range of addressing modes it supports. Addressing modes determine how the operands for an instruction are accessed,
The 8051 has two types of memory and these are Program Memory and Data Memory. Program Memory (ROM) is used to permanently save the program being executed, while Data Memory (RAM) is used for temporarily storing data and intermediate results created and used during the operation of the microcontroller. Let’s have a brief detail of
The 8051 microcontroller is one of the most popular and widely used microcontrollers in the world. It was first introduced by Intel in 1980 and has since been used in a wide range of applications, including industrial control systems, automotive systems, consumer electronics, and more. In this article, we will explore the features of the
Various assembler directives in 8051 microcontrollers are used during assembly language programming. Unlike instructions being compiled and written to chip program memory, directives are commands of assembly language itself and have no influence on the operation of the microcontroller. Some of them are obligatory part of every program while some are used only to facilitate
