Digital filter for sigma delta modulators (DFSDM) RM0402
378/1163 RM0402 Rev 6
Bits 13:12 DATMPX[1:0]: Input data multiplexer for channel y
0:Data to channel y are taken from external serial inputs as 1-bit values. DFSDM_CHyDATINR
register is write protected.
1: Reserved
2: Data to channel y are taken from internal DFSDM_CHyDATINR register by direct CPU/DMA write.
There can be written one or two 16-bit data samples according DATPACK[1:0] bit field setting.
3:Reserved
This value can be modified only when CHEN=0 (in DFSDM_CHyCFGR1 register).
Bits 11:9 Reserved, must be kept at reset value.
Bit 8 CHINSEL: Channel inputs selection
0: Channel inputs are taken from pins of the same channel y.
1: Channel inputs are taken from pins of the following channel (channel (y+1) modulo 8).
This value can be modified only when CHEN=0 (in DFSDM_CHyCFGR1 register).
Bit 7 CHEN: Channel y enable
0: Channel y disabled
1: Channel y enabled
If channel y is enabled, then serial data receiving is started according to the given channel setting.
Bit 6 CKABEN: Clock absence detector enable on channel y
0: Clock absence detector disabled on channel y
1: Clock absence detector enabled on channel y
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 CKINy input - sampling point according SITP[1:0]
1:clock coming from internal CKOUT output - sampling point according SITP[1:0]
2:clock coming from internal CKOUT - sampling point on each second CKOUT falling edge.
For connection to external Σ∆ modulator which divides its clock input (from 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 CKOUT output - sampling point on each second CKOUT rising edge.
For connection to external Σ∆ modulator which divides its clock input (from 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_CHyCFGR1 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 DATINy pin: rising edge = logic 0, falling edge = logic 1
11: Manchester coded input on DATINy pin: rising edge = logic 1, falling edge = logic 0
This value can only be modified when CHEN=0 (in DFSDM_CHyCFGR1 register).
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