ST7MC2 datasheet(176/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

Figure 96. Simulated commutation event generation with only 1 Hall effect sensor (SC bit =1)

Note: If the SC bit is set during Z event interrupt,

then the 8*8 bit hardware multiplication result must

be overwritten in the MCOMP register. Otherwise,

when the SC bit is set, the result of the multiplica-

tion is not taken into account after a Z event.

Figure 97. Simulated commutation and Z event

C interrupt

SC set in MCRC

After C interrupt

MCOMP is written for Cs event

if MCOMP<=MTIM

Immediate CS generation

C interrupt

SC reset in MCRB

Next C event = CH with 8*8 bit multiplication

Z zero-crossing event

D Demagnetisation event

CH Hardware commutation

CS Simulated commutation

SC bit is reset

Z zero-crossing event

D Demagnetisation event

CH Hardware commutation

CS Simulated commutation

MCOMP

the result of the

hardware multiplication is put

in MCOMP-->CH and compared

SC bit is set during Z IT

the hardware multiplication is taken

into account but the value in MCOMP

can be overwritten

SC bit is already set when Z IT

occurs. The hardware multipli-

-cation is not taken into account

A value has to be written

in the MCOMP register

with MTIM once written

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