Capture/Compare Channels; Figure 97. Capture/Compare Channel (Example: Channel 1 Input Stage); Figure 98. Capture/Compare Channel 1 Main Circuit - ST STM32F40 Series Reference Manual

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Capture/compare channels

Each Capture/Compare channel is built around a capture/compare register (including a

shadow register), a input stage for capture (with digital filter, multiplexing and prescaler) and

an output stage (with comparator and output control).

The input stage samples the corresponding TIx input to generate a filtered signal TIxF.

Then, an edge detector with polarity selection generates a signal (TIxFPx) which can be

used as trigger input by the slave mode controller or as the capture command. It is

prescaled before the capture register (ICxPS).

The output stage generates an intermediate waveform which is then used for reference:

OCxRef (active high). The polarity acts at the end of the chain.

give an overview of one Capture/Compare channel.

read_in_progress

Capture/compare preload register

capture_transfer

Capture/compare shadow register

Doc ID 018909 Rev 4

Advanced-control timers (TIM1&TIM8)

TI1F_Falling

(from channel 2)

TI2F_falling

(from channel 2)

MCU-peripheral interface

compare_transfer

to the slave mode controller

/1, /2, /4, /8

(from slave mode

write_in_progress

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