ST7FMC1M2T3 データシートの表示（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)

10.6.7 Delay Manager

Figure 91. Overview of MTIM Timer in Switched and Autoswitched Mode

Tratio

MCRA register

SWA bit

ZH

MZREG [Zn]§

ck

8-bit Up Counter MTIM §

8

Z

clr

1

0

C

DH

MDREG [Dn]§

ZH / ZS

Compare

MCRC register

SZ bit

Filter /D

MZFR register

ZWF[3:0]

ZS

MZPRV [Zn-1]§

MCOMP [Cn+1]§

Compare

MCRB register

SDM* bit

Filter /C

MDFR register

DWF[3:0]

DS

CH,S

DS,H

ZH,S

To interrupt generator

To interrupt generator

To interrupt generator

Compare

MCRC register

SC bit

§ = Register updated on R event

CH / CS

This part of the MTC contains all the time-related

functions, its architecture is based on an 8-bit shift

left/shift right timer shown in Figure 91. The MTIM

timer includes:

– An auto-updated prescaler

– A capture/compare register for simulated de-

magnetization simulation (MDREG)

– Two cascaded capture and one compare regis-

ters (MZREG and MZPRV) for storing the times

between two consecutive BEMF zero crossings

(ZH events) and for zero-crossing event simula-

tion (ZS)

– An 8x8 bit multiplier for auto computing the next

commutation time

– One compare register for phase commutation

generation (MCOMP)

The MTIM timer module can work in two main

modes when driving synchronous motors in six-

steps mode.

In switched mode the user must process the step

duration and commutation time by software.

In autoswitched mode the commutation action is

performed automatically depending on the rotor

position information and register contents. This is

called the hardware commutation event CH. When

enabled by the SC bit in the MCRC register, com-

mutation can also be simulated by writing a value

directly in the MCOMP register that is compared

with the MTIM value. This is called simulated com-

mutation CS (See “Built-in Checks and Controls for

simulated events” on page 175.).

Both in switched mode and autoswitched mode , if

the SC bit in the MCRC register is set (software

commutation enabled), no comparison between

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