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NEWDAT56/78 CAN Registers

Hi,

There's something I don't understand about the NEWDAT registers on the TMS570.

As I understand it each bit of a NEWDATx register denotes a new message has arrived in the corresponding message box. These are 32 bit registers and there are 64 message boxes, so that fills up NEWDAT12 and NEWDAT34. So what do NEWDAT56 and NEWDAT78 do?

Regards

Andy