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XE166 Derivatives Peripheral Units (Vol. 2 of 2) Capture/Compare Unit 6 (CCU6) 18.2.3 T12 Compare Mode Associated with Timer T12 are three individual capture/compare channels, that can perform compare or capture operations with regard to the contents of the T12 counter. The capture functions are explained in Section 18.2.5. 18.2.3.1 Compare Channels In Compare Mode (see Figure 18-9), the three individual compare channels CC60 CC61, and CC62 can generate a three-phase PWM pattern. Counter Register T12 fT12 Compare Match CM_60 Comp. =? Comp. =? Comp. =? Compare Register CC60R Compare Register CC61R Compare Register CC62R Compare Match CM_61 Compare Match CM_62 T12_ST Compare Shadow Register CC60SR Compare Shadow Register CC61SR Compare Shadow Register CC62SR CCU6_MCA05513 Figure 18-9 T12 Channel Comparators Each compare channel is connected to the T12 counter register via its individual equalto comparator, generating a match signal when the contents of the counter matches the contents of the associated compare register. Each channel consists of the comparator and a double register structure - the actual compare register CC6xR, feeding the comparator, and an associated shadow register CC6xSR, that is preloaded by software and transferred into the compare register when signal T12 shadow transfer, T12_ST, gets active. Providing a shadow register for the compare value as well as for other values related to the generation of the PWM signal facilitates a concurrent update by software for all relevant parameters of a three-phase PWM. User’s Manual CCU6, UM_V0.5D3 18-14 V2.1, 2008-08
