ST7FMC2N6B6(2004) 데이터 시트보기 (PDF) - STMicroelectronics

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ST7FMC2N6B6
(Rev.:2004)

8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, BRUSHLESS MOTOR CONTROL, FIVE TIMERS, SPI, LINSCI™

STMicroelectronics 

ST7MC1/ST7MC2

MOTOR CONTROLLER (Cont’d)

Figure 94. Simulated commutation event generation with only 1 Hall effect sensor (SC bit =1)

After C interrupt

MCOMP is written for Cs event

if MCOMP<=MTIM

Immediate CS generation

Z

Z

C interrupt

SC reset in MCRB

Next C event = CH with 8*8 bit multiplication

Z

D

CS

CS

CH

D

CS

CS

CH

C interrupt

SC set in MCRC

Z zero-crossing event

D Demagnetisation event

CH Hardware commutation

CS Simulated commutation

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

then the 8*8 bit hardware multiplication result can

be overwritten in the MCOMP register. Otherwise,

t

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

tion is not taken into account after a Z event.

Figure 95. Simulated commutation and Z event

SC bit is reset

SC bit is set during Z IT

the result of the

the hardware multiplication is taken

hardware multiplication is put into account but the value in MCOMP

in MCOMP-->CH and compared can be overwritten

with MTIM once written

Z

Z

Z

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

Z

D

CH

D

Cs

MCOMP

register

D

Cs

Z zero-crossing event

D Demagnetisation event

CH Hardware commutation

CS Simulated commutation

t

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