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DocID024597 Rev 3 631/1693

RM0351 Digital filter for sigma delta modulators (DFSDM)

657

21.6.2 DFSDM channel configuration y register (DFSDM_CHCFGyR2)

(y=0..7)

This register specifies the parameters used by channel y (y = 0..7).

Address offset: 0x04

Reset value: 0x0000 0000

Bit 5 SCDEN: Short-circuit detector enable on channel y

0: Input channel y will not be guarded by the short-circuit detector

1: Input channel y will be continuously guarded by the short-circuit detector

Bit 4 Reserved, must be kept at reset value.

Bits 3:2 SPICKSEL[1:0]: SPI clock select for channel y

0:clock coming from external DFSDM_CKINy input - sampling point according SITP[1:0]

1:clock coming from internal DFSDM_CKOUT output - sampling point according SITP[1:0]

2:clock coming from internal DFSDM_CKOUT - sampling point on each second DFSDM_CKOUT

falling edge.

For connection to external  modulator which divides its clock input (from DFSDM_CKOUT) by 2

to generate its output serial communication clock (and this output clock change is active on

each clock input rising edge).

3:clock coming from internal DFSDM_CKOUT output - sampling point on each second

DFSDM_CKOUT rising edge.

For connection to external  modulator which divides its clock input (from DFSDM_CKOUT) by 2

to generate its output serial communication clock (and this output clock change is active on each

clock input falling edge).

This value can be modified only when CHEN=0 (in DFSDM_CHCFGyR1 register).

Bits 1:0 SITP[1:0]: Serial interface type for channel y

00: SPI with rising edge to strobe data

01: SPI with falling edge to strobe data

10: Manchester coded input on DFSDM_DATINy pin: rising edge = logic 0, falling edge = logic 1

11: Manchester coded input on DFSDM_DATINy pin: rising edge = logic 1, falling edge = logic 0

This value can only be modified when CHEN=0 (in DFSDM_CHCFGyR1 register).

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

OFFSET[23:8]

rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

OFFSET[7:0] DTRBS[4:0] Res. Res. Res.

rw rw rw rw rw rw rw rw rw rw rw rw rw

ST STM32L4x6 User Manual

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