ST7MC2 datasheet(223/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

CONFIGURATION REGISTER (MCONF)

Read/Write

Reset Value: 0000 0010 (02h)

Bits 7:4 = DS[3:0]: Delay for sampling at Ton

These bits are used to define the delay inserted

before sampling in order to sample during PWM

ON time.

Table 77. Sampling Delay

Note: Times are indicated for 4 MHz fPERIPH

Bit 3 = SOI Sampling Out Interrupt flag.

This interrupt indicates that the sampling that

should have been done during Ton has occured

during the next Toff. In this case, the sample is dis-

carded.

0: No Sampling Out Interrupt Pending

1: Sampling Out Interrupt Pending

Bit 2 = SOM: Sampling Out Mask bit.

This interrupt is available only for Z event sampling

as D event sampling is always done at fSCF high

frequency.

0: Sampling Out interrupt disabled

1: Sampling Out interrupt enabled

This interrupt is available only when a delay has

been set in the DS[3:0] bits in the MCONF register.

Note: It is recommended to disable the sampling

out interrupt when software Z event is enabled (SZ

bit in MCRC register is set) and if the value in the

DS[3:0] bits is modified to change the sampling

method during the application.

Bits [1:0] = XT16:XT8 BLDC drive Motor Control

Peripheral input frequency selection:

Table 78. Peripheral frequency

Caution: It is recommended to set the peripheral

frequency to 4MHz. Setting fPERIPH=fMTC is used

mainly when fclk = 4MHz (for low power consump-

tion).

DS3

DS2

DS1

DS0

SOI

SOM

XT16

XT8

DS3 DS2 DS1 DS0

Delay added to sample at Ton

No delay added. Sample during Toff

2.5 µs

5 µs

7.5 µs

10 µs

12.5 µs

15 µs

17.5 µs

20 µs

22.5 µs

25 µs

27.5 µs

µs

32.5

µs

37.5

µs

XT16

XT8

Peripheral frequency

fPERIPH=fMTC

fPERIPH=fMTC/2

fPERIPH=fMTC/4

(same as XT16=1,XT8=0)

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