ST7LITE49K2 datasheet(89/245 Pages) STMICROELECTRONICS

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ST7LITE49K2

On-chip peripherals

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Figure 42.

Dead time generation

In the above example, when the DTE bit is set:

●

PWM goes low at DCR0 match and goes high at ATR1+Tdt

●

PWM1 goes high at DCR0+Tdt and goes low at ATR match.

With this programmable delay (Tdt), the PWM0 and PWM1 signals which are generated are

not overlapped.

Break function

The break function can be used to perform an emergency shutdown of the application being

driven by the PWM signals.

The break function is activated by the external BREAKx pins. This can be selected by using

the BRxSEL bits in BREAKCRx register. In order to use the break function it must be

previously enabled by software setting the BPENx bits in the BREAKCRx registers.

The Break active level can be programmed by the BRxEDGE bits in the BREAKCRx

registers. When an active level is detected on the BREAKx pins, the BAx bits are set and the

break function is activated. In this case, the PWM signals are forced to BREAK value if

respective OEx bit is set in PWMCR register.

Software can set the BAx bits to activate the break function without using the BREAKx pins.

The BREN1 and BREN2 bits in the BREAKEN register are used to enable the break

activation on the 2 counters respectively. In Dual Timer mode, the break for PWM2 and

PWM3 is enabled by the BREN2 bit. In Single Timer mode, the BREN1 bit enables the

break for all PWM channels.

DCR0+1

ATR1

DCR0

Tdt

Tdt = DT[6:0] x Tcounter1

PWM 0

PWM 1

CNTR1

CK_CNTR1

Tcounter1

OVF

PWM 0

PWM 1

counter = DCR0

counter = DCR1

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