ST7DALIF2 datasheet(75/171 Pages) STMICROELECTRONICS

75 / 171 page

ST7DALIF2

12-bit autoreload timer 2 (AT2)

75/171

Figure 36.

PWM signal from 0% to 100% duty cycle

14.3.2

Output compare mode

To use this function, load a 12-bit value in the DCRxH and DCRxL registers.

When the 12-bit upcounter (CNTR) reaches the value stored in the DCRxH and DCRxL

registers, the CMPF bit in the PWMxCSR register is set and an interrupt request is

generated if the CMPIE bit is set.

Note:

The output compare function is only available for DCRx values other than 0 (reset value).

14.3.3

Break function

The break function is used to perform an emergency shutdown of the power converter.

The break function is activated by the external BREAK pin (active low). In order to use the

BREAK pin it must be previously enabled by software setting the BPEN bit in the BREAKCR

When a low level is detected on the BREAK pin, the BA bit is set and the break function is

activated.

Software can set the BA bit to activate the break function without using the BREAK pin.

When the break function is activated (BA bit =1):

●

The break pattern (PWM[3:0] bits in the BREAKCR) is forced directly on the PWMx

output pins (after the inverter).

●

The 12-bit PWM counter is set to its reset value.

●

The ARR, DCRx and the corresponding shadow registers are set to their reset values.

●

The PWMCR register is reset.

When the break function is deactivated after applying the break (BA bit goes from 1 to 0 by

software):

●

The control of PWM outputs is transferred to the port registers.

COUNTER

FFDh

FFEh

FFFh

FFDh

FFEh

FFFh

FFDh

FFEh

DCRx=000h

DCRx=FFDh

DCRx=FFEh

DCRx=000h

ATR= FFDh

fCOUNTER

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