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Author Topic: i2c baud rate  (Read 2511 times)
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planet69
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« on: February 27, 2008, 08:26:13 08:26 »

i'm using PIC18F452 and i've got a question about i2c function.
1) is it true that i can set any fixed baud rate (clock) from 0 to 100KHz?
2) if i set SSPSTAT,SMP=1, what value should i put into SSPADD if i'm using crystal 4MHz?
3) if i set SSPSTAT,SMP=0, is the baud rate fixed to 400KHz or i'm free to set any baud rate from 0 to 400KHZ? what value should i put into SSPADD then using a 20MHZ crystal?

answers are appreciated.
Thank you. Smiley
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tomzi
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« Reply #1 on: March 02, 2008, 02:53:22 14:53 »

hi,
1) i think you can set it
2) value in BRG should be 28h (SSPADD = b'x0101000'
3) i think you can set it, for baud rate 400kHz and xtal 20MHz value in SSPAD should be b'x0110010'
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abbas1707
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« Reply #2 on: March 02, 2008, 08:02:29 20:02 »

i wrote my own i2c code.but how can i find that  at which rate communication is going on?? can anyone tell me some method to find it??
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planet69
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« Reply #3 on: March 03, 2008, 02:17:51 02:17 »

i think i understand it now.
we can set any value 0-400KHz based on the setting of SMP bit
using the formula, BRG = ((Fosc / Fclock X 4)) - 1, the value for SSPADD is found
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