Hello group.  I am trying to figure out what I need to do to 
interface my MSP430F149 to a Microchip 24LC256 serial eeprom.  I 
have read the TI doc SLAA115, "I2C Interfacing of the MSP430 to a 
24xx Series EEPROM", and app. notes on the Microchip website.  The 
SLAA115 references a sample application that no longer exists under 
that name on the TI site.  According to what I have read, I can just 
use any two general I/O pins for the SCL clock line and SDA data 
line and I need to add pull-up resistors on the lines in order to 
get the logic highs and lows by changing the pin directions.  I get 
all this.  However, I don't get how or what is needed to generate 
and control the clock signal line.  This particular eeprom has a max 
frequency of 400 kHz.

Can someone please clear this up for me?  Any links to sample code 
or further explanation would be greatly appreciated.

Thank you in advance.

Mike

I have posted the code for this a while ago.

If you can't find it let me know.

Ted Gregorius (Pres)
TAG Systems Racing Products, Inc.
www.tagrace.com
  ----- Original Message ----- 
  From: pitbullpc2 
  To: msp430@msp4... 
  Sent: Thursday, October 16, 2003 3:10 PM
  Subject: [msp430] I2C interface w/ external EEPROM


  Hello group.  I am trying to figure out what I need to do to 
  interface my MSP430F149 to a Microchip 24LC256 serial eeprom.  I 
  have read the TI doc SLAA115, "I2C Interfacing of the MSP430 to a 
  24xx Series EEPROM", and app. notes on the Microchip website.  The 
  SLAA115 references a sample application that no longer exists under 
  that name on the TI site.  According to what I have read, I can just 
  use any two general I/O pins for the SCL clock line and SDA data 
  line and I need to add pull-up resistors on the lines in order to 
  get the logic highs and lows by changing the pin directions.  I get 
  all this.  However, I don't get how or what is needed to generate 
  and control the clock signal line.  This particular eeprom has a max 
  frequency of 400 kHz.

  Can someone please clear this up for me?  Any links to sample code 
  or further explanation would be greatly appreciated.

  Thank you in advance.

  Mike


        
             
       
       

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