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Pin Diagram Of 8051 Microcontroller

 

Pin diagram of 8051 Microcontroller

 

Schematic pin diagram of 8051 Microcontroller
 

 

Table: Alternative functions of pins P3.0 to P3.7

Port 3 Alternative function
P3.0 Acts as serial input data pin (R×D)
P3.1 Acts as serial output data pin (T×D)
P3.2 Acts as external interrupt pin 0 (INT0 )
P3.3 Acts as external interrupt input pin 1 (INT1)
P3.4 Acts as external input to timer 0 (T0)
P3.5 Acts as external input to timer 1 (T1)
P3.6 Acts as write control signal for external data memory (WR)
P3.7 Acts as read control signal for external data memory read operation (RD)

Oscillator circuit
 

 

Instruction cycle of 8051 microcontroller

 

 

A pin of Port 1

 

 

A pin of Port 0

 

 

Writing ‘1’ to output pin P1.X of Port 1

 





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