What are different types of instructions in 8051?
The instruction set of microcontroller 8051 can be divided into the following groups: Data transfer instructions. Arithmetic instructions. Logical Instructions (Boolean).
What are the logical instructions in 8051?
List of logical instructions in 8051
| Operation | Mnemonics | Description |
|---|---|---|
| Clear | CLR A | [A]<-0 |
| Complement | CPL A | [A]<-[A]’ |
| Rotate left | RL A | Shifts the value in accumulator to the left |
| RLC A | Shifts the value in accumulator to the left through the accumulator |
Which register in an 8051 microcontroller contains the SMOD bit?
The SMOD Bit in the PCON Register is used to control the Baud Rate of the Serial Port. There are two general purpose Flag Bits in the PCON Register, which can be used by the programmer during execution.
What are different types of instructions?
Depending on operation they perform, all instructions are divided in several groups:
- Arithmetic Instructions.
- Branch Instructions.
- Data Transfer Instructions.
- Logic Instructions.
- Bit-oriented Instructions.
Which of the following instruction is an example of logical instructions?
Logical instructions in 8085 microprocessor
| OPCODE | OPERAND | EXAMPLE |
|---|---|---|
| ORA | R | ORA B |
| ORA | M | ORA 2050 |
| ORI | 8-bit data | ORI 50 |
| XRA | R | XRA B |
Which register has the SMOD bit and what is its status when the 8051 is powered up?
It is 8-bit register. When 8051 is powered up, SMOD is zero.By setting the SMOD, baud rate can be doubled. If SMOD = 0 (which is its value on reset), the baud rate is 1/64 the oscillator frequency.
Which register in an 8051 microcontroller contains the SMOD bit Mcq?
power control register
The power control register is It has SMOD bit which is used to double the baud rate.
What are microcontroller registers?
A register is just a location in memory that you can write data to or read data from. Some of us refer to registers as “locations”. Special Function Registers. The special function registers (or simply SFR’s) on a microcontroller are just like the registers in data RAM.
How many instructions are in the 8051 microcontroller instruction set?
As a typical 8-bit processor, the 8051 Microcontroller instructions have 8-bit Opcodes. As a result, the 8051 Microcontroller instruction set can have up to 2 8 = 256 Instructions.
What are assembly language directives in the 8051 microcontroller assembler?
Assembly Language Directives are not the instructions to the 8051 Microcontroller Assembler even though they are written in the Mnemonic field of the program. Assembly Language Directives are actually instructions to the Assembler and directs the Assembler Program what to do during the process of Assembling.
What is the 8051 instruction set of the Keil ax51?
The 8051 Instruction Set is supported by the Keil Ax51 Macro Assembler and the in-line Assembler of the Keil Cx51 Compiler. This manual contains the following chapters: Architecture Overview describes the memory layout and CPU registers of several 8051 variants. Opcodes lists all opcodes ordered by opcode HEX value.
What is a microcontroller program?
Just as our sentences are made of words, a Microcontroller’s (for that matter, any computer) program is made of Instructions. Instructions written in a program tell the Microcontroller which operation to carry out. An Instruction Set is unique to a family of computers.