Input Capture Mode; Figure 160. Capture/Compare Channel 1 Main Circuit; Figure 161. Output Stage Of Capture/Compare Channel (Channel 1) - ST STM32F101 series Reference Manual

Advanced arm-based 32-bit mcus

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The capture/compare block is made of one preload register and one shadow register. Write

and read always access the preload register.

In capture mode, captures are actually done in the shadow register, which is copied into the

preload register.

In compare mode, the content of the preload register is copied into the shadow register

which is compared to the counter.

Input capture mode

In Input capture mode, the Capture/Compare Registers (TIMx_CCRx) are used to latch the

value of the counter after a transition detected by the corresponding ICx signal. When a

capture occurs, the corresponding CCXIF flag (TIMx_SR register) is set and an interrupt or

a DMA request can be sent if they are enabled. If a capture occurs while the CCxIF flag was

already high, then the over-capture flag CCxOF (TIMx_SR register) is set. CCxIF can be

read_in_progress

Capture/compare preload register

capture_transfer

Capture/compare shadow register

DocID13902 Rev 15

General-purpose timers (TIM9 to TIM14)

MCU-peripheral interface

compare_transfer

write_in_progress