ST7MC1K2-Auto datasheet(253/371 Pages) STMICROELECTRONICS

253 / 371 page

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On-chip peripherals

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Figure 118. PWM generator block diagram

Functional description

The three PWM signals are generated using a free-running 12-bit PWM counter and three 13-bit

compare registers for phase U, V and W: MCMPU, MCMPV and MCMPW registers respectively.

A fourth 12-bit register is needed to set-up the PWM carrier frequency: MCMP0 register.

Each of these compare registers is buffered with a preload register. Transfer from preload to active

registers is done synchronously with PWM counter underflow or overflow depending on configuration.

This allows compare values to be written without risks of spurious PWM transitions.

The block diagram of the PWM generator is shown in Figure 118.

Prescaler

The 12-bit PWM counter clock is supplied through a 3-bit prescaler to allow the generation of lower PWM

carrier frequencies. It divides Fmtc by 1, 2, 3, ..., 8 to get Fmtc-pwm.

This prescaler is accessed through three bits PCP[2:0] in MPCR register; this register is buffered: the

new value is taken into account after a PWM update event.

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 up/down

Prescaler

PCP[2:0] bits

Reg

event

Update of compare registers PWM

Notes

Preload registers transferred to

active registers on U event

Fmtc

MPCR register

interrupt generation

Repetition

counter

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