Hii ,
While dealing with a router hardware I found there are two uart ports , i found one uart port is used for debugging, what is the use of the other uart port . why devices will be having two uart ports

 

Hii ,
While dealing with a router hardware I found there are two uart ports , i found one uart port is used for debugging, what is the use of the other uart port . why devices will be having two uart ports

Maybe the other uart port is for communication or configuration.
One is for debugging the device.

 

Sometimes you want to talk with multiple devices using a simple protocol.

 

There is nothing unusual with having two UART ports,
I am using a chip that has 6 UART ports.

 

There is nothing unusual with having two UART ports,
I am using a chip that has 6 UART ports.[/QUOT

Are they used for communication between mcu and other parts of pcb

 

Maybe, maybe not.
Here are some possible usage for multiple UARTs.

1) Communicate with other external devices and controllers on a bus or network, RS-485, CAN, irDA, WiFi, Bluetooth, NFC, USB, X10, modem.
2) Communicate with local devices on the PCB, e.g. temperature sensor, accelerometer, GPS, RTC.
3) Communicate with external devices and peripherals, scanner, printer, camera, keyboard, mouse.
4) Communicate with other MCU.
5) Communicate with a host PC.