MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 342
MCBSTM32EXL
Manufacturer Part Number
MCBSTM32EXL
Description
BOARD EVALUATION FOR STM32F103ZE
Manufacturer
Keil
Specifications of MCBSTM32EXL
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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General-purpose timer (TIMx)
14.3.10
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One pulse mode
One Pulse Mode (OPM) is a particular case of the previous modes. It allows the counter to
be started in response to a stimulus and to generate a pulse with a programmable length
after a programmable delay.
Starting the counter can be controlled through the slave mode controller. Generating the
waveform can be done in output compare mode or PWM mode. You select One Pulse Mode
by setting the OPM bit in the TIMx_CR1 register. This makes the counter stop automatically
at the next update event UEV.
A pulse can be correctly generated only if the compare value is different from the counter
initial value. Before starting (when the timer is waiting for the trigger), the configuration must
be:
In upcounting: CNT<CCRx ARR (in particular, 0<CCRx),
In downcounting: CNT>CCRx.
Figure 131. Example of one pulse mode.
For example you may want to generate a positive pulse on OC1 with a length of t
after a delay of t
Let’s use TI2FP2 as trigger 1:
●
●
●
●
Map TI2FP2 on TI2 by writing IC2S=’01’ in the TIMx_CCMR1 register.
TI2FP2 must detect a rising edge, write CC2P=’0’ in the TIMx_CCER register.
Configure TI2FP2 as trigger for the slave mode controller (TRGI) by writing TS=’110’ in
the TIMx_SMCR register.
TI2FP2 is used to start the counter by writing SMS to ‘110’ in the TIMx_SMCR register
(trigger mode).
DELAY
OC1REF
TIM1_CCR1
TIM1_ARR
OC1
TI2
as soon as a positive edge is detected on the TI2 input pin.
0
Doc ID 13902 Rev 9
t
DELAY
t
PULSE
t
PULSE
RM0008
and
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