ST7LITE3 datasheet(59/167 Pages) STMICROELECTRONICS

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ST7LITE3

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DUAL 12-BIT AUTORELOAD TIMER 3 (Cont’d)

Break Function

The break function can be used to perform an

emergency shutdown of the application being driv-

en by the PWM signals.

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 soft-

ware setting the BPEN bit in the BREAKCR regis-

ter.

When a low level is detected on the BREAK pin,

the BA bit is set and the break function is activat-

ed. In this case, the 4 PWM signals are stopped.

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 BREAK-

CR) is forced directly on the PWMx output pins

(after the inverter).

– The 12-bit PWM counter CNTR1 is put to its re-

set value, i.e. 00h.

– The 12-bit PWM counter CNTR2 is put to its re-

set value,i.e. 00h.

– ATR1, ATR2, Preload and Active DCRx are put

to their reset values.

– The PWMCR register is reset.

– Counters stop counting.

When the break function is deactivated after ap-

plying the break (BA bit goes from 1 to 0 by soft-

ware):

– The control of the 4 PWM outputs is transferred

to the port registers.

Figure 39. Block Diagram of Break Function

PWM0

PWM1

PWM2

PWM3

PWM0

PWM1

PWM2

PWM3

BREAKCR Register

BREAK pin

PWM counter -> Reset value

ATRx & DCRx -> Reset value

PWM Mode -> Reset value

When BA is set:

(Active Low)

(Inverters)

Note:

The BREAK pin value is latched by the BA bit.

PWM0

PWM1

PWM2

PWM3

BPEN

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