ST7FL15F1MAE STMICROELECTRONICS [STMicroelectronics], ST7FL15F1MAE Datasheet - Page 57

• Manufacturer Part Number: ST7FL15F1MAE
• Description: 8-bit MCU for automotive with single voltage Flash/ROM memory, data EEPROM, ADC, 5 timers, SPI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

DUAL 12-BIT AUTORELOAD TIMER 4 (cont’d)
11.2.3.3 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. 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 (in ROM
devices the active level is not programmable; the
break active level is low level). When an active lev-
el 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 the
respective OEx bit is set in the 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 two
counters respectively. In Dual Timer Mode, the
break for PWM2 and PWM3 is enabled by the
Figure 38. Block Diagram of Break Function
BREAKEN Register
BREAK pin
BREN2
BREN1
Level
Selection
BREDGE
BA
BREAKCR Register
BPEN
ENCNTR2 bit
PWM3
BREAKCR Register
PWM2
BREN2 bit. In Single Timer Mode, the BREN1 bit
enables the break for all PWM channels. In ROM
devices, BREN1 and BREN2 are both forced by
hardware at high level and all PWMs are enabled.
When a break function is activated (BA bit = 1 and
BREN1/BREN2 = 1):
– The break pattern (PWM[3:0] bits in the
– The 12-bit PWM counter CNTR1 is put to its re-
– The 12-bit PWM counter CNTR2 is put to its re-
– ATR1, ATR2, Preload and Active DCRx are put
– 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 Timer takes the control of the PWM
ports.
PWM0/1 Break Enable
PWM2/3 Break Enable
BREAKCR is forced directly on the PWMx output
pins if respective OEx is set (after the inverter).
set value, that is 00h (if BREN1 = 1).
set value, that is 00h (if BREN2 = 1).
to their reset values.
PWM2
PWM3
PWM0
PWM1
PWM1
PWM0
(Inverters)
OEx
ST7L15, ST7L19
PWM0
PWM1
PWM2
PWM3
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