ST7MC2S4-Auto datasheet(223/371 Pages) STMICROELECTRONICS

223 / 371 page

Obsolete

Product(s)

- Obsolete

Product(s)

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

On-chip peripherals

223/371

recommended to write the MCOMP register during the Z interrupt routine to avoid any spurious

comparison as several consecutive Cs events can be generated.

Note that two different simulated events can be used in the same step (like DS followed by ZS).

Note also that for more precision, it is recommended to use the value captured from the preceding

hardware event to compute the value used to generate simulated events.

Figure 96, Figure 97 and Figure 98 shows details of simulated event generation.

Figure 97.

Simulated commutation event generation with only 1 hall effect sensor (SC bit = 1)

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 multiplication is not taken into account after a 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.

Zero-crossing event

Demagnetization event

Hardware commutation

Simulated commutation

Obsolete

Product(s)

- Obsolete

Product(s)

ST7MC2S4-Auto Datenblatt(PDF) 223 Page - STMicroelectronics