The instructions of 8051 Microcontroller can be classified into five different groups. These groups are like belowData Transfer GroupArithmetic GroupLogical GroupProgram Branch GroupBit Processing GroupThis Bit-Processing group is also known as Boolean Variable Manipulation.Like 8085, some instruction has two operands. The first operand is the Destination, and the second operator ... Read More

In 8051 Microcontroller there is 17 different instructions under the Logical Group. In total there are 17 opcodes. The Carry Flag (CY) acts like the single-bit accumulator in different bit processing instructions.In the following table, we will see the Mnemonics, Lengths, Execution Time in terms of the machine cycle, Number ... Read More

Signed integers are numbers with a “+” or “-“ sign. If n bits are used to represent a signed binary integer number, then out of n bits, 1 bit will be used to represent a sign of the number and rest (n - 1)bits will be utilized to represent magnitude ... Read More

In this problem, we will see how to convert 8-bit BCD number to its Binary (Hexadecimal)equivalent. The BCD number is stored at location 20H. After converting, the results will be stored at 30H.So let us assume the data is D5H. The program converts the binary value ofD5H to BCD value ... Read More

Here we will see how 8279 Chip can be used to interface a matrix keyboard with 8085 microprocessors. This chip can be used either keyboard/display interfacing mode or as a strobed input port. But generally, it is used as keyboard interfacing.The keyboard interfacing schemes can also be divided into two ... Read More

Now in this section, we will see the interrupt structure of Intel 8051 microcontroller.Interrupts are basically the events that temporarily suspend the main program, pass the control to the external sources and execute their task. It then passes the control to the main program where it had left off.8051 has ... Read More

The @font-face rule is used to define the location of a font for download, although this may run into implementation-specific limits.ExampleLet us see an example    

Use the mask effect to turn transparent pixels to a specified color and makes opaque pixels transparent. The following parameter is used in this filterS.NoParameter & Description1ColorThe color that the transparent areas will become.ExampleYou can try to run the following code to implement mask effectLive Demo           ... Read More

In 8085 Instruction set, Read Interrupt Mask. It is a 1-Byte multi-purpose instruction. It is used for the following purposes.To check whether RST7.5, RST6.5, and RST5.5 are masked or not;To check whether interrupts are enabled or not;To check whether RST7.5, RST6.5, or RST5.5 interrupts are pending or not;To perform serial ... Read More

In this section we will see how to write and execute programs for 8051 microcontroller using the Keil Software.Download KeilHere is the download link of Keil. You can download it and install it very easily. We are using C51 version for 8051 devices.https://www.keil.com/download/product/Use Keil to write programs for 8051 MicrocontrollerStart ... Read More