I2C interface w/ external EEPROM

Started by pitbullpc2 October 16, 2003
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


Beginning Microcontrollers with the MSP430

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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