I2C CONFUSION, Help needed please

[FromTheCockpit]

Tried this:

Pause 500
	DEBUG "Start......",13,10
Value=0
Addr=$9B
Loc=0

Main:
High Led : Pause 500: Low Led : PAUSE 500
	I2CWRITE SDA,SCL,ADDR,LOC
Addr=$1B : PAUSE 50
	I2CREAD SDA,SCL,ADDR,LOC,[VALUE],Fail
	PAUSE 25
	DEBUG  HEX Value,13,10
	PAUSE 250
	DEBUG "Done....",13,10
WHILE 1 : WEND
Goto Main

Fail:
	toggle portc.2
goto main

Didn't worked. (Value/Addr/Loc = Byte size)

'=======
Can I not the Micro at 4MHz? The Datasheet says MAX speed is 400KHz, so I assume lower speeds are supported. Am I right?

[LinkMTech]

Remove the PAUSE 50 after I2CWRITE because the device starts sending immediately if its happy.

Then try bit 6 then 5 instead for the Write bit if the Write bit position was a wrong guess.
Bit 6 = $5B
Bit 5 = $3B

[LinkMTech]

Yeah, 400kHz is the max speed so at 4MHz it will run closer to 100kHz

[FromTheCockpit]

OSCCON changed to set 4MHz, internal oscillator.
I2CSLOW 1 stays commented
I2CHOLD 1 stays commented

LED 	Var PortC.0
Value Var 	Byte
Addr	Var	Byte
Loc 	Var	Byte
'---------------------------------------------------------
Pause 500
	DEBUG "Start......",13,10
Value=0
Addr=$9B 'Tried $3B,$5B
Loc=0

Main:
High Led : Pause 500: Low Led : PAUSE 500
	I2CWRITE SDA,SCL,ADDR,LOC
	Addr=$1B
	I2CREAD SDA,SCL,ADDR,LOC,[VALUE],Fail
	PAUSE 25
	DEBUG  HEX Value,13,10
	PAUSE 250
	DEBUG "Done....",13,10
WHILE 1 : WEND
Goto Main

Fail:
	toggle portc.2
goto main

No Luck

> It is bit 7 for R/W (Slave address + write bit)

[LinkMTech]

> It is bit 7 for R/W (Slave address + write bit)

How did you find that?

[FromTheCockpit]

Picked up from the datasheet of the device. That is what I understood, am I wrong?
Though I did tried $3B & $5B.

[LinkMTech]

Not sure if you're wrong or not. I'm still trying to decipher that part in the datasheet because they don't make it easy. I've found that some information has to be gleaned from other devices of the same manufacturer to put the whole story together, kinda sucks!

I also noticed the address stays at $1B after the first loop in your test program and if it works you might miss it.

Note: I just found one of my programs on another I2C device that has bit 1=0 as the Write bit.
$1B = $00011011 used for Read
$1A = $00011010 used for Write