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[PIC] dsPIC30F4011 - UART with internal oscillator

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It IS posible but may not be reliable as you found out. Although the dsPIC is designed to be as stable as possible, it will never match the accuracy or stability (temperature/voltage/age) of a crystal. It will also be far more critical of supply line noise and decoupling as any signals on the supply will tend to modulate the oscillator frequency.

Brian.
 

The data sheet for the dsPIC30F4011 is quite clear: the FRC delivers 7.37MHz (Table 24-13, Page 187, Parameter OS10 for the "FRC Internal"; also mentioned in Table 24-17, Page 190 where it talks about the conditions for the accuracy).
I do admit that Table 21-1 on page 152 does list the FRC as "8MHz Internal RC oscillator" but the lines underneath it all refer to the 7.37MHz FRC so I'm guessing it may be either a misprint or a "rounding" of the frequency (really bad if it is!).
Susan
 
Aussie Susan said:
The data sheet for the dsPIC30F4011 is quite clear: the FRC delivers 7.37MHz (Table 24-13, Page 187, Parameter OS10 for the "FRC Internal"; also mentioned in Table 24-17, Page 190 where it talks about the conditions for the accuracy).
I do admit that Table 21-1 on page 152 does list the FRC as "8MHz Internal RC oscillator" but the lines underneath it all refer to the 7.37MHz FRC so I'm guessing it may be either a misprint or a "rounding" of the frequency (really bad if it is!).
Susan
Click to expand...

This is a very good point!

Anyway, I have learnt that using internal oscillator is a bad idea, so topic can be closed.
 

Try to use UART1... Maybe

UART2_Write_Text("Start");
UART2_Write(13);
UART2_Write(10);

Is not in the library FOR uart2. The same happens to me with the printf("Something")!!!
 

Murray11 said:
Try to use UART1... Maybe

UART2_Write_Text("Start");
UART2_Write(13);
UART2_Write(10);

Is not in the library FOR uart2. The same happens to me with the printf("Something")!!!
Click to expand...


Sorry, but I already said that my code STARTED WORKING just after connecting the 16MHz crystal and setting the appropriate config bits.
 

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