ST7FOXK2 datasheet(87/226 Pages) STMICROELECTRONICS

87 / 226 page

ST7FOXF1, ST7FOXK1, ST7FOXK2

On-chip peripherals

87/226

Figure 40.

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 BREAK pin. This can be selected by using

the BRSEL bit in BREAKCR register. In order to use the break function it must be previously

enabled by software setting the BPEN bit in the BREAKCR register.

The Break active level can be programmed by the BREDGE bit in the BREAKCR register.

When an active level is detected on the BREAK pin, the BA bit is 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 BA bit to activate the break function without using the BREAK pin. 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

ST7FOXK2 数据表(PDF) 87 Page - STMicroelectronics

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