ST7MC1K2 datasheet(197/371 Pages) STMICROELECTRONICS

197 / 371 page

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Table 88 shows the event control selected by the ZVD and CPB bits. In most cases, the D

and Z events have opposite edge polarity, so the ZVD bit is usually 0.

Demagnetization (D) event

At the end of the demagnetization phase, current no longer goes through the free-wheeling

diodes. The voltage on the non-excited winding terminal goes from one of the power rail

voltages to the common star connection voltage plus the BEMF voltage. In some cases (if

the BEMF voltage is positive and the free-wheeling diodes are at ground for example) this

end of demagnetization can be seen as a voltage edge on the selected MCIx input and it is

called a hardware demagnetization event DH. See Table 88.

The D event filter can be used to select the number of consecutive D events needed to

generate the DH event.

If enabled by the HDM bit in the MCRB register, the current value of the MTIM timer is

captured in register MDREG when this event occurs in order to be able to simulate the

demagnetization phase for the next steps.

1110

1111

Table 88.

ZVD and CPB edge selection bits(1)

Legend:

DW = D window filter

DEF = D event filter

ZWF = Z window filter

ZEF = Z event filter. Refer also to Table 92 on page 207.

ZVD bit

CPB bit

Event generation vs input data sampled

Note:

The ZVD bit is located in the MPOL register, the CPB bit is in the MCRB register.

Table 87.

Z event filter setting (continued)

ZEF3

ZEF2

ZEF1

ZEF0

Z event limit

CDH

ZWF

ZEF

DEF

DWF

CDH

ZWF

ZEF

DEF

DWF

CDH

ZWF

DEF

ZEF

DWF

CDH

ZWF

DWF

DEF

ZEF

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