Using the L6474 when Reading the Status Byte with the GetParam(0x20 + 0x19) and GetStatus() or Command(0xD0) I get different results for the Status Byte.

[KiptonM]

To be honest the difference is 0x7F03 for the ReadParam() and 0xFF03 for the GetStatus()

The documentation L6474Data Sheet (DoclD022529 Rev 4) says Bits 13, 14, and 15 should be 1 all the time. In one case Bit 15 is always 0 and the other case Bit 15 is always 1

 

In case you think I am doing something wrong:

The CS being high is 920 ns or more. It must be > 800 ns

And the SCK is 4 MHz and has to be less than 5 MHz.

[KiptonM · Accepted solution]

waclawek.jan (Community Member)

Mentioned to me in another post that the SPI interface was Mode 3, and I was using Mode 0.

The documentation does not mention the mode at all. It just shows the timing diagram. And I missed it.

So in the configuration tool (MX) CPOL = High, and CPHA = 2 Edge.

And make the change to the Logic Analyzer.