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TMS320F28069: Number of mail boxes needed for CCP implementation

Part Number: TMS320F28069


CCP block from TI library is using 3 mail boxes. 28xx family processor has only 32 mail boxes. Simple CCP implantation needs only 2 mail boxes. Why CCP block from TI library needs 3 mail box? Is there any method to reduce the number of mail boxes for CCP usage or to increase number of mail boxes for this processors?