ST7MC1 datasheet(199/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

10.6.10 PWM Generator Block

The PWM generator block produces three inde-

pendent PWM signals based on a single carrier

frequency with individually adjustable duty cycles.

Depending on the motor driving method, one or

three of these signals may be redirected to the oth-

er functional blocks of the motor control peripheral,

using the PCN bit in the MDTG register.

When driving PM BLDC motors in six-step mode

(voltage mode only, either sensored or sensor-

less) a single PWM signal (Phase U) is used to

supply the Input Stage, PWM and Channel Man-

ager blocks according to the selected modes.

For other kind of motors requiring independent

PWM control for each of the three phases, all

PWM signals (Phases U, V and W) are directed to

the channel manager, in which deadtime or a high

frequency carrier may be added. This is the case

of AC induction motors or PMAC motors for in-

stance, supplied with 120° shifted sinewaves in

voltage mode.

10.6.10.1 Main Features

■ 12-bit PWM free-running Up/Down Counter with

up to 16MHz input clock (Fmtc).

■ Edge-aligned

and

center-aligned

PWM

operating modes

■ Possibility to re-load compare registers twice

per PWM period in center-aligned mode

■ Full-scale PWM generation

■ PWM update interrupt generation

■ 8-bit repetition counter

■ 8-bit PWM mode

■ Timer re-synchronisation feature

Figure 117. PWM generator block diagram

MREP Register

12-bit Compare 0 Register

12-bit PWM Counter

13-bit Compare W Register

Up to 16MHz

CMS bit

13-bit Compare U Register

13-bit Compare V Register

Clear or Up/Down

Prescaler

PCP[2:0] bits

Reg

event:

Update of compare registers

Notes:

Preload registers transferred

to active registers on U event

Fmtc

MPCR Register

PWM interrupt generation

Repetition

counter

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