参数资料
型号: ST7PL35F2MCXXXRE
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
封装: 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-20
文件页数: 123/168页
文件大小: 2955K
代理商: ST7PL35F2MCXXXRE
Obsolete
Product(s)
- Obsolete
Product(s)
ST7L34, ST7L35, ST7L38, ST7L39
58/168
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 four 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, that is, 00h.
– The 12-bit PWM counter CNTR2 is put to its re-
set value, that is, 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 four PWM outputs is trans-
ferred to the port registers.
Figure 40. Block Diagram of Break Function
PWM0
PWM1
PWM2
PWM3
1
0
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
BA
1
相关PDF资料
PDF描述
ST7PL35F2UA/XXXE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
ST7L35F2UA/XXXRE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
ST7L35F2UC/XXXRE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
ST7L39F2MC/XXXE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
ST7L39F2UC/XXXRE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
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