topic Re: Help me for- Multi-Master I2C MC68HC908LJ24 in 8-bit Microcontrollers

Help me for- Multi-Master I2C MC68HC908LJ24

Vijay — Fri, 03 Feb 2006 12:46:56 GMT

Hi All

Can anybody please help me about onchip I2C module in MC68HC908LJ24.

I am interfacing external RTC through I2C interface. But I am unable to read successive registers contents of RTC. It is reading only first register and not increamenting the address.

If anybody has Example code for MMIIC module (I2C) pls send me the example code. Thanks..

Regards,

Vijay

Re: Help me for- Multi-Master I2C MC68HC908LJ24

Muhammad — Sun, 26 Mar 2006 15:25:13 GMT

I've read your message but I'm sorry I can't help because I'm facing a problem with the IIC interface on my LK24.

I need to know the proper sequence of initializing the MMIIC module.

Can you help me?!

Thanks in advance.

Best regards

Re: Help me for- Multi-Master I2C MC68HC908LJ24

Vijay — Mon, 27 Mar 2006 14:25:08 GMT

Hi Muhammad,

I am giving you code for initialization of MMIIC Module. Please follow this sequence :

   MMCR_MMEN      = 1;              // Enable IIC;
  MIMCR_MMBB     = 1;              // Clear bus busy flag;
  MMCR_MMTXAK   = 1;            // Clear Ack flag.
  MIMCR_MMRW     = 0;            // R/W bit = 0;
  MIMCR_MMAST    = 0;            // Slave mode
  MIMCR_MMNAKIF = 0;
  MIMCR_MMALIF    = 0;             // Clear flags;
   MMSR                    = 0;             // Clear all flags (Status register);
  MIMCR_MMBR      = 0;             // Set speed to 25kHz for Bus = 4MHz;

Best Regards,

Vijay

Re: Help me for- Multi-Master I2C MC68HC908LJ24

Ellery — Wed, 11 Apr 2007 21:38:40 GMT

One of the features of the MC68HC908LJ24 is an on-board RTC.

Why would you design to use an external RTC?