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shlomipeleg

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2008/09/15 08:43

SSI/MICROWIRE format

Hi,

We are using the SSI interface of LM3S6965 for the following terget:

We want to write configuration values to device with SPI-compatible serial interface: When SPIFss goes high, the 24 bits (NOT 4 to 16 bits as in the datasheet) which have been clocked into the input register on each rising edge of SCLK will get transferred to the 3 latches of the device.

Is there is any way to do so?

Do you have any example or idea for 24-bit writing with this bus?

Can we use the MICROWIRE format interface?

Many Thanks!

Shlomi

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SourceTwo

Expert Boarder 		Click here to see the profile of this user

2008/09/15 09:35

Re:SSI/MICROWIRE format

Hello Shlomi,

Please see my comments to the post of 2008/05/20 "SSI or SPI with data sizes bigger than 16 bits". In summary, 2 of the 4 Motorola formats will allow you to transfer >16 bits.

Regards,
Dave

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LMI Dan

Moderator 		Click here to see the profile of this user

2008/09/15 12:30

Re:SSI/MICROWIRE format

Dear Shlomi,
Dave is correct, with some of the SSI formats (like the TI mode and SPI) you may be able to manipulate the frame signal to fit your needs, depending on your data rate and mode, however the Microwire format is half-duplex, this would be difficult to do.

The SSI module on our device does not officially support 24 bit frames only up to 16 bits. What device are you trying to interface to? Does it support another mode besides the Microwire?

-Dan

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