1. Home
  2. Embedded Programming
  3. IIC on H8S/2633?

IIC on H8S/2633?

Greetings all:

I'm having difficulty getting the I2C module on the Renesas/Hitachi HD64F2633RTE28 to work properly for reads. (Bus Master only, single byte reads)

Writes work great.

Reads work mostly, but half the time I get an extra

9 clocks for a single byte read. It only works if I insert a delay after the clearing IRIC after the first reading of ICDR. Sometimes the controller freezes with SCL held low. The target (slave) is an FM24C256.

What I need to see is some correct non-interrupt C code (single byte write) that works. The application notes from Renesas are no help at all, with errors and poor descriptions.

(Note: to reply, delete the last character before .com)

regards, DArcy Roberts H T Watt and Associates Ltd.

Reply to
Darcy Roberts
Loading thread data ...

Which suggests you have not got the acknowledge bit setting correct and/or a timing error on setting registers.

The newest application note that covers that module is

Using The Tiny IýC Interface In Master Mode H8/3664N

Which includes commented C listings available from the European Renesas site. The same IIC module is used in the H8/Tiny series as the H8S/2633, Some functions may be disabled, but there is enough there to get you going.

Try the following app notes

Or the general IIC page

My experiences with IIC and H8/H8S is mainly with adding the Philips PCF8584 controller to a processor that did not have the IIC controller due to the fact of design change after hardware and code for first stage was almost complete.

--
Paul Carpenter		| paul@pcserv.demon.co.uk
        Main Site
              GNU H8 & mailing list info.
             For those web sites you hate.
Reply to
Paul Carpenter

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.