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i2c master reception

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alexbilo

Joined: 01 Jun 2004
Posts: 39
Location: Trois-Rivières

i2c master reception

Posted: Wed Sep 29, 2004 2:43 pm

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Hi,

I read this section in the PIC18fxx2 datasheet (doc 39564b.pdf) and I don't really understand the logic of it :

Quote:

Note: In the MSSP module, the RCEN bit must
be set after the ACK sequence or the
RCEN bit will be disregarded.

This in the section 15.4.11 (p. 155).

Anyone can tell me what that means? I would figure that the master should initiate the ack sequence after having actually received the data...

Thanks,
_________________
Alex

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Wed Sep 29, 2004 5:27 pm

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Quote:

Anyone can tell me what that means? I would figure that the
master should initiate the ack sequence after having actually received the data...

Look at Figure 15-22 in the data sheet. In the top line, which shows
the SDA signal, look where it says "ACK from Slave". Then right
after that, it says "Master configured as Receiver by programming
SSPCON2[3], RCEN = 1". This shows the timing that they're referring to.

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