Blog

Hello Geeks, in this tutorial I will introduce you with 8051 embedded family so Let’s start :

Pin detail (8051) in Embedded c :

• Port0 (Pins 32-39) – AD0/AD7 and P0.0 to P0.7
• Port1 (Pins 1 to 8) – P1.0 to P1.7
• Port2 – (Pins 21 to 28) – P2.0 to P2.7 and A8 to A15
• Port3 – (Pins 10 to 17) – P3.0 to P3.7
• P3.0 – is used as RXD pin for serial communication.
• P3.1 – TXD pin for Serial Transmit Data.
• P3.2 – External Interrupt0 Pin, INT0
• P3.3 – External Interrupt1 Pin, INT1
• P3.4 – T0 – Clock Input for counter0.
• P3.5 – T1 – Clock Input for counter1.
• P3.6 – WR – Signal to write to the external memory.
• P3.7 – RD – Signal to read from the external memory.
• Vcc – 5V supply
• Vss – Ground
• XTAL2/XTAL1 – Oscillator Input
• RST – Restart 8051
• ALE – Address Latch Enable
• PSEN – Program Store Enable

Which 8051 Instructions Set in Embedded System ?

We know that Basically 8051 instruction set is divided into 5 groups like:

1. Data Transfer Instructions
2. Logic Instructions
3. Bit Oriented Instruction
4. Arithmetic Instructions
5. Branch Instructions

How to write simple embedded c code ?

Lets we write a simple code to Blink LED in simple way. so in hardware specific code, we use hardware peripherals like different ports, timers etc. 

#include <reg52.h>

void msdelay(unsigned int t)

{

unsigned int i,j;

for(i=0;i<t;i++)

for(j=0;j<1275;j++);

}

void main()

{

while(1)

{

S=0X0F;

msdelay(250);

S=0X00;

msdelay(250);

}

}

Some FAQ about embedded 8051 :

Summary :

In this article we saw 8051 basic overview – simple embedded c code i.e. Pin detail of 8051/ instruction set .