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ST72321R7-Auto датащи(PDF) 90 Page - STMicroelectronics

номер детали ST72321R7-Auto
подробное описание детали  PLL for 2x frequency multiplication
PDF  243 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321R7-Auto датащи(HTML) 90 Page - STMicroelectronics

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PWM auto-reload timer (ART)
ST72321xx-Auto
90/243
Doc ID 13829 Rev 1
Figure 37.
PWM auto-reload timer function
Figure 38.
PWM signal from 0% to 100% duty cycle
12.2.6
Output compare and time base interrupt
On overflow, the OVF flag of the ARTCSR register is set and an overflow interrupt request is
generated if the overflow interrupt enable bit, OIE, in the ARTCSR register, is set. The OVF
flag must be reset by the user software. This interrupt can be used as a time base in the
application.
12.2.7
External clock and event detector mode
Using the fEXT external prescaler input clock, the auto-reload timer can be used as an
external clock event detector. In this mode, the ARTARR register is used to select the
nEVENT number of events to be counted before setting the OVF flag.
nEVENT = 256 - ARTARR
Caution:
The external clock function is not available in Halt mode. If Halt mode is used in the
application, prior to executing the HALT instruction, the counter must be disabled by clearing
the TCE bit in the ARTCSR register to avoid spurious counter increments.
DUTY CYCLE
REGISTER
AUTO-RELOAD
REGISTER
t
255
000
WITH OEx=1
AND OPx=0
(ARTARR)
(PWMDCRx)
WITH OEx=1
AND OPx=1
COUNTER
t
FDh
FEh
FFh
FDh
FEh
FFh
FDh
FEh
OCRx=FCh
OCRx=FDh
OCRx=FEh
OCRx=FFh
ARTARR = FDh
fCOUNTER



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