ST7FMC1M2T3 查看數據表（PDF） - STMicroelectronics

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ST7FMC1M2T3

8-bit MCU with nested interrupts, Flash, 10-bit ADC, brushless motor control, five timers, SPI, LINSCI™

STMicroelectronics 

ST7MC1xx/ST7MC2xx

MOTOR CONTROLLER (Cont’d)

Figure 92. Step Ratio Functional Diagram

fPERIPH

R+

+1

MTIM Timer = 100h? 1 / 2

4

MPRSR Register ST[3:0] Bits

1 / 2Ratio

-1

Zn < 55h?

R-

Tratio

ck

2 MHz - 62.5 Hz

MTIM Timer control over Tratio and register operation

MTIM Timer Overflow

Begin

Z Capture with MTIM Timer Underflow (Zn < 55h)

Begin

No

Ratio < Fh?

Yes

Ratio = Ratio + 1

MZREG = MZREG / 2

MZPRV = MZPRV/2

MDREG = MDREG/2

MCOMP = MCOMP/2**

Counter = Counter/2

End

Slow-down control

** Only in Auto-switched mode (SWA=1 in MCRA register)

No

Ratio > 0?

Yes

Ratio = Ratio - 1

MZREG = MZREG x 2

MZPRV = MZPRV x 2

MDREG = MDREG x 2

Counter = Counter x 2

Compute MCOMP

End

Speed-up control

170/309

1

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