In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

If you are using SX/B then use the I2CSPEED before any I2C statements or subroutines (just once at the top of the application, for example). This lets you multiply the base SX I2C speed (100khz) by whatever you want. 

I2CSPEED 2.0
' would make any subsequent I2C statements run w/approx. 200khz clock

I2CSPEED 4.0
' would be 400khz

'applies to any subsequent SX/B statements such as
'I2CSTART
'I2CSEND
'I2CSTOP
'etc

[quote="What's New IN SXB 2"]I2CSPEED Directive 
 
The I2CSPEED directive will adjust the speed of the I2C commands(I2CSTART, I2CSTOP, 
I2CSEND and I2CRECV). Using "I2CSPEED 4" will make the commands execute 4 times faster. 
Using "I2CSPEED 0.5" will make the commands execute 1/2 as fast. This feature was added 
because some devices are capable of faster speeds, and some devices require slower 
speeds. NOTE: This is a directive and not a command. It does not generate any code by 
itself, and functions completely top-down. [/quote]

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