8051 Microcontroller Ports details

8051 microcontrollers have 4 I/O ports each of 8-bit, which can be configured as input or output. Hence, total 32 input/output pins allow the microcontroller to be connected with the peripheral devices.
Pin configuration, i.e. the pin can be configured as 1 for input and 0 for output as per the logic state.
Input/Output (I/O) pin − All the circuits within the microcontroller must be connected to one of its pins except P0 port because it does not have pull-up resistors built-in.
Input pin − Logic 1 is applied to a bit of the P register. The output FE transistor is turned off and the other pin remains connected to the power supply voltage over a pull-up resistor of high resistance.
Port 0 − The P0 (zero) port is characterized by two functions −
When the external memory is used then the lower address byte (addresses A0A7) is applied on it, else all bits of this port are configured as input/output.
When P0 port is configured as an output then other ports consisting of pins with built-in pull-up resistor connected by its end to 5V power supply, the pins of this port have this resistor left out.
Thank You for Watching

[@Afawazsadhak-qq1th]

I have mailed to you ,sir. Please sir. Waiting for your response in anticipation. 🙏😭

[@meenambigaiselva6878]

Sir please give some tips to prepare for polytechnic lecturer exam

[@DearTechlovers143]

Hi sir

[@DhanasekariM-vp4ns]

Clear explanation.. thank you sir

[@lovedogs1359]

Sir v semester microcontroller handle panara polytechnic la unmai solla pona unga video pathu tha na class edukaran

[@AGMS1234]

Sir please Diploma EEE 4th sem Digital Electronics ku oru playlist podunga🙏🏻🙏🏻🙏🏻🙏🏻
Micro Controller ku basic adhudhannu solranga please sir

[@shivaneelu1972]

Sir i have completed ur all videos about m/c sir... Pls add more videos fast sir pls complete the whole chapter

[@aswatharya4742]

Sir why we are using transistor wt is the use of transistor why we need transistor please sir rply

[@kavishkarkavishkar3128]

வணக்கம் சார் மிகவும் நன்றி சார்

[@vasudevanv6814]

Next videos la eppo varum sir? Eagerly waiting

[@sathiyaseelanm905]

Sir measurements and instruments video podunga sir please....

[@raghakeerthana9358]

Sir 12th ku important topics solunga sir

[@vasanthanedumaran7181]

Digital Elactronics pathi video poduga Sir....

[@AVPowerVision]

Sir..Waiting for next video of latching circuit

[@arunbavanc8165]

very use full video sir

[@chandruprabakaran6892]

Very nicely explained Sir! Thank you

[@naveenvibes2747]

Nice i will learn easily

[@balasundaramparameshwaran539]

Suuuuper sir.... amazing

[@1inallAI]

Sir இதுக்கு என்ன group எடுக்கனும்.sir

[@uaakash4377]

EEE

[@rakeshkumar098]

ECE