Discussion in "ARM Development" started by    diana1234    May 28, 2015.
Thu May 28 2015, 07:15 AM
#1
Hello there,

I am using a MCU LPC2468/78 and in its datasheet or user manual i noticed that some of chip functions are also repeated at some other pins of MCU, for example

P0[0]/RD1/TXD3/SDA1 , P0[1]/TD1/RXD3/SCL1 and
P0[25]/AD0[2]/I2SRX_SDA/TXD3 , P0[26]/AD0[3]/AOUT/RXD3 and
P4[28]/BLS2/MAT2[0]/TXD3 , P4[29]/BLS3/MAT2[1]/RXD3


In the above three different port pins there is repeated TXD3 fucnction and in the other 3 pairs there is repeated RXD3 function.
Please tell is these are different functions or the same fuction which i can use from any one of above 3 port pins.

In my understanding, i am assuming it as -
If a programmer is using I2C function from pins P0[0] and P0[1] then UART3 function is restricted to him from that pair of pins, in that case he can use the UART3 function from the remaining 2 pair of port pins.
Am I right or wrong?
Please give some light on this topic!

Thank you
Fri May 29 2015, 04:56 PM
#2


P0[0]/RD1/TXD3/SDA1 , P0[1]/TD1/RXD3/SCL1 and
P0[25]/AD0[2]/I2SRX_SDA/TXD3 , P0[26]/AD0[3]/AOUT/RXD3 and
P4[28]/BLS2/MAT2[0]/TXD3 , P4[29]/BLS3/MAT2[1]/RXD3


In the above three different port pins there is repeated TXD3 function and in the other 3 pairs there is repeated RXD3 function.
Please tell is these are different functions or the same function.

diana1234



As you say,these are the same functions available
from any one of above 3 port pins.


If a programmer is using I2C function from pins P0[0] and P0[1] then UART3 function is restricted to him from that pair of pins, in that case he can use the UART3 function from the remaining 2 pair of port pins.
Am I right or wrong?

diana1234


I would say you are right.
 diana1234 like this.
Sat May 30 2015, 07:40 AM
#3
Thank you ExperimentarUK

Also please tell me how i can measure current flowing in any one of the load portion of the circuit(if there are diferent loads in the circuit) thrugh an ADC chennel.
If through a sensing resister, then how and where i can introduce that resister in the circuit.

Thank you once again
Tue Jun 02 2015, 04:30 PM
#4


If through a sensing resister, then how and where i can introduce that resister in the circuit.

diana1234


That depends on the circuit.
You will have to post your circuit.

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