ST7PLITE35F2M6TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7PLITE35F2M6TR

8-bit MCU with single voltage Flash, data EEPROM, ADC, timers, SPI, LINSCI™

STMicroelectronics 

ST7LITE3xF2

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):

Figure 40. Block Diagram of Break Function

BREAK pin (Active Low)

– 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.

BREAKCR Register

BA BPEN PWM3 PWM2 PWM1 PWM0

PWM0

PWM1

PWM2

PWM3

Note:

The BREAK pin value is latched by the BA bit.

(Inverters)

1

PWM0

PWM1

PWM2

PWM3

0

When BA is set:

PWM counter -> Reset value

ATRx & DCRx -> Reset value

PWM Mode -> Reset value

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