How many instructions are there in 8051 microcontroller?
Table of Contents
How many instructions are there in 8051 microcontroller?
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 28 = 256 Instructions.
What are directives in 8051?
The following are the widely used 8051 assembler directives. ORG (origin) The ORG directive is used to indicate the starting address. It can be used only when the program counter needs to be changed. The number that comes after ORG can be either in hex or in decimal. Eg: ORG 0000H ;Set PC to 0000.
What are directives in microcontroller?
Directives are commands of assembly language itself and have no influence on the operation of the microcontroller 8051 DIRECTIVES. 10. EQU directive The EQU directive is used to replace a number by a symbol.
What is the function of program counter in 8051 microcontroller?
The Program Counter (PC) is a 2-byte address which tells the 8051 where the next instruction to execute can be found in the memory. PC starts at 0000h when the 8051 initializes and is incremented every time after an instruction is executed.
How many registers are there in 8051?
The 8051 contains two 16-bit registers: the program counter (PC) and the data pointer (DPTR).
How many timers Counters 8051 16-bit microprocessor have?
The 8051 has two timers, Timer 0 and Timer 1. They can be used as timers or as event counters. Both Timer 0 and Timer 1 are 16-bit wide. Since the 8051 follows an 8-bit architecture, each 16 bit is accessed as two separate registers of low-byte and high-byte.
How many hardware interrupts are there in 8051?
8051 has 5 interrupt signals, i.e. INT0, TFO, INT1, TF1, RI/TI. Each interrupt can be enabled or disabled by setting bits of the IE register and the whole interrupt system can be disabled by clearing the EA bit of the same register.
What are data types in 8051 microcontroller?
Data Types in 8051 Embedded C
| Data type | Bits | Value range |
|---|---|---|
| bit | 1 | 0 to 1 |
| signed char | 8 | -128 to +127 |
| unsigned char | 8 | 0 to 255 |
| enum | 8 or 16 | -128 to +127 or -32768 to +32767 |
How many SFR are there in 8051?
21 SFR’s
There are 21 SFR’s (special function registers) in microcontroller 8051. The SFR is the upper area of addressable memory, from address OX80 to OXff. These SFR’s contain all peripherally related register like P0, P1, P2, P3, timers or counters, serial part and interrupt related registers.
Which register is 8-bit counter?
The accumulator is an 8-bit register (can store 8-bit data) that is the part of the arithmetic and logical unit (ALU). After performing arithmetical or logical operations, the result is stored in accumulator. Accumulator is also defined as register A.
How many GPR are there in 8051 microcontroller?
The 8051 has 4 registers bank . The B0, B1, B2, and B3 stand for banks and each bank contains eight general purpose registers ranging from ‘R0’ to ‘R7’.
Which of the following SFR of 8051 microcontroller is 16-bit?
DPTR – Data pointer is the 8051’s only user-accessible 16 bit (2 – byte) register. DPTR is meant for pointing to data. It is used by the 8051 to access external memory using the address indicated by DPTR.