Bob,  still not having too much luck..  what values of pullup resistors for
100KHz operation?  I'm using 10K ones at the moment.

Your code:  don't think it makes much difference, but SSPSTAT is in bank 1
not bank0.  The values you loaded into SSPADD aren't correct (if you use the
formula) - but again, don't know if this would make a difference...

Jim

----- Original Message -----
From: Bob Corkery <bcorkery@VICR.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: 19 October 1999 20:06
Subject: Re: Question on SSPCON in 16F877, I2C Master


> ;set up I2C Port
>         bsf     STATUS,RP0      ;Bank 1
>         movlw   0x60
>         movwf   SSPCON2
> ;       movlw   0x03            ;400KHz @ 4MHz Clock
>         movlw   0x0A            ;100KHz @ 4MHz Clock
>         movwf   SSPADD
>         bcf     STATUS,RP0      ;Bank 0
>         clrf    SSPSTAT
>         movlw   0x28
>         movwf   SSPCON
>         bsf     SSPCON,SSPEN
>
>
> ;
> ; I2C Master Write to Dallas DS1803
> ;
> WriteI2C:
>         bcf     STATUS,RP0      ;Bank 0
>         bcf     PIR1,SSPIF
>         bsf     STATUS,RP0      ;Bank 1
>         bsf     SSPCON2,SEN     ;send Start bit
>         bcf     STATUS,RP0      ;Bank 0
> mw1     btfss   PIR1,SSPIF
>         goto    mw1
>
>         movlw   0x50            ;send control byte, identify the correct
DS1803
>         movwf   SSPBUF
>         bcf     PIR1,SSPIF
> mw2     btfss   PIR1,SSPIF      ;wait for ACK
>         goto    mw2
>
>         movf    Data1,0         ;send command byte; ie Write Pot1
>         movwf   SSPBUF
>         bcf     PIR1,SSPIF
> mw3     btfss   PIR1,SSPIF      ;wait for ACK
>         goto    mw3
>
>         movf    Data2,0         ;send data byte
>         movwf   SSPBUF
>         bcf     PIR1,SSPIF
> mw4     btfss   PIR1,SSPIF      ;wait for ACK
>         goto    mw4
>
>         bcf     PIR1,SSPIF
>         bsf     STATUS,RP0      ;Bank 1
>         bsf     SSPCON2,PEN     ;Send Stop bit
>         bcf     STATUS,RP0      ;Bank 0
> mw5     btfss   PIR1,SSPIF
>         goto    mw5
>         return
>
> ______________________________ Reply Separator
_________________________________
> Subject: Question on SSPCON in 16F877
> Author:  Jim Main <j.main@NET.NTL.COM> at Internet
> Date:    10/19/1999 6:47 PM
>
>
> I'm trying to get a 16F877 to talk to a 24LC02B -  so far without much
> success...
>
> In SSPCON, the bottom 4 bits set up the I2C mode.  I've tried  1000  -
where
> clock = Fosc/(4*(SSPADD+1)) & couldn't get it to work.
>
> Does anyone know what I2C firmware controlled master mode is (& what speed
> it would run at & whether it's clock dependant)
>
> & what does "slave idle" mean in the context of the above.
>
> Has anyone got I2C master mode working on the '877??
>
> Jim
> ---
>