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参数资料
型号： ST7FLITE19BF0B6
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP20
封装： 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-20
文件页数： 119/159页
文件大小： 2855K
代理商： ST7FLITE19BF0B6
ST7LITE1xB
62/159
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 or internal comparator output. 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.
When a break function is activated (BA bit =1 and
BREN1/BREN2 =1):
– The break pattern (PWM[3:0] bits in the BREAK-
CR) is forced directly on the PWMx output pins if
respective OEx is set. (after the inverter).
– The 12-bit PWM counter CNTR1 is put to its re-
set value, i.e. 00h (if BREN1 = 1).
– The 12-bit PWM counter CNTR2 is put to its re-
set value,i.e. 00h (if BREN2 = 1).
– ATR1, ATR2, Preload and Active DCRx are put
to their reset values.
– Counters stop counting.
When the break function is deactivated after ap-
plying the break (BA bit goes from 1 to 0 by soft-
ware), Timer takes the control of PWM ports.
Figure 41. Block Diagram of Break Function
PWM0
PWM1
PWM2
PWM3
PWM0
PWM1
PWM2
PWM3
BREAKCR Register
BREAK pin
(Inverters)
PWM0
PWM1
PWM2
PWM3
BPEN
BA
Comparator
Level
Selection
BRSEL
BREDGE BREAKCR Register
ENCNTR2 bit
BREN1
BREN2
BREAKEN Register
PWM0/1 Break Enable
PWM2/3 Break Enable
OEx
1
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相关代理商/技术参数
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