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

'==================================================
I2C_WRITE:
' Write a single byte to an I2C Device
' USAGE:
'    I2C_WRITE DeviceAddress, RegisterAddress, DataToBeWritten
'
   I2C_Device             = __param1
   I2C_RegAddr            = __param2
   I2C_Dataout            = __param3
   I2CSt                  ' start communication
   I2CSn I2C_Device       ' send the device address
   I2CSn I2C_RegAddr      ' send the register address
   I2CSn I2C_Dataout      ' send the data to put in the register
   I2CSp                  ' stop communication
   RETURN

 

'==================================================
I2C_READ:
' Get a byte from the I2C device
' USAGE:
'    myVar = I2C_READ DeviceAddress, RegisterAddress
'       
   I2C_Device             = __param1
   I2C_RegAddrn           = __param2
   I2CSt                  ' start communication
   I2CSn I2C_Device       ' send the device address
   I2CSn I2C_RegAddr      ' send the register address
   I2CSt                  ' restart for read
   I2CSn i2c_device       ' resend the device address
   Temp = i2crcv 
   i2csn $i2c_dataout     ' send the data to put in the register
   i2csp                  ' stop communication
   RETURN


'==================================================
I2CSt:
   I2CStart I2CData
   return
'==================================================
I2CSp:
   I2CStop I2CData
   return
'==================================================
I2CSn:
   Temp = __PARAM1
   I2CSend I2CData,Temp
   return
'==================================================
I2CRcv:
   I2CRecv I2CData,Temp   ' get one byte from i2c device
   return Temp
 
 One last point.  I don't have this chip so I don't have a way to test this out.  However, there is enough data above to get you started.  If you get stuck, I would recommend looking at the DS1307 chip on the Prof Dev Board and trying to get that to work first.
 
 John.

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