Figure 76. Input Channel Pins Redirection - ST STM32F413 Reference Manual

Digital filter for sigma delta modulators (DFSDM)
Output clock generation
A clock signal can be provided on CKOUT pin to drive external Σ∆ modulator clock inputs.
The frequency of this CKOUT signal is derived from DFSDM clock or from audio clock (see
CKOUTSRC bit in DFSDM_CH0CFGR1 register) divided by a predivider (see CKOUTDIV
bits in DFSDM_CH0CFGR1 register). If the output clock is stopped, then CKOUT signal is
set to low state (output clock can be stopped by CKOUTDIV=0 in DFSDM_CHyCFGR1
register or by DFSDMEN=0 in DFSDM_CH0CFGR1 register). The output clock stopping is
performed:
•
4 system clocks after DFSDMEN is cleared (if CKOUTSRC=0)
•
1 system clock and 3 audio clocks after DFSDMEN is cleared (if CKOUTSRC=1)
Before changing CKOUTSRC the software has to wait for CKOUT being stopped to avoid
glitch on CKOUT pin. The output clock signal frequency must be in the range 0 - 20 MHz.
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Figure 76. Input channel pins redirection

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