ST STM32L4x6 Reference Manual page 636

Digital filter for sigma delta modulators (DFSDM)
Bit 17 RSWSTART: Software start of a conversion on the regular channel
0: Writing '0' has no effect
1: Writing '1' makes a request to start a conversion on the regular channel and causes RCIP to
become '1'. If RCIP=1 already, writing to RSWSTART has no effect. Writing '1' has no effect if
RSYNC=1.
This bit is always read as '0'.
Bits 16:15 Reserved, must be kept at reset value.
Bits 14:13 JEXTEN[1:0]: Trigger enable and trigger edge selection for injected conversions
00: Trigger detection is disabled
01: Each rising edge on the selected trigger makes a request to launch an injected conversion
10: Each falling edge on the selected trigger makes a request to launch an injected conversion
11: Both rising edges and falling edges on the selected trigger make requests to launch injected
conversions
This bit can be modified only when DFEN=0 (DFSDMx_CR1).
Bits 12:11 Reserved, must be kept at reset value.
Bits 10:8 JEXTSEL[2:0]: Trigger signal selection for launching injected conversions
0x0-0x7: Trigger inputs selected by the following table.
This bit can be modified only when DFEN=0 (DFSDMx_CR1).
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
Refer to
Bits 7:6 Reserved, must be kept at reset value.
Bit 5 JDMAEN: DMA channel enabled to read data for the injected channel group
0: The DMA channel is not enabled to read injected data
1: The DMA channel is enabled to read injected data
This bit can be modified only when DFEN=0 (DFSDMx_CR1).
Bit 4 JSCAN: Scanning conversion mode for injected conversions
0: One channel conversion is performed from the injected channel group and next the selected
channel from this group is selected.
1: The series of conversions for the injected group channels is executed, starting over with the
lowest selected channel.
This bit can be modified only when DFEN=0 (DFSDMx_CR1).
Writing JCHG if JSCAN=0 resets the channel selection to the lowest selected channel.
Bit 3 JSYNC: Launch an injected conversion synchronously with the DFSDM0 JSWSTART trigger
0: Do not launch an injected conversion synchronously with DFSDM0
1: Launch an injected conversion in this DFSDM at the very moment when an injected conversion is
launched in DFSDM0 by its JSWSTART trigger
This bit can be modified only when DFEN=0 (DFSDMx_CR1).
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DFSDM0 DFSDM1
DFSDM_INTRG0 DFSDM_INTRG0
DFSDM_INTRG1 DFSDM_INTRG1
DFSDM_INTRG2 DFSDM_INTRG2
DFSDM_INTRG3 DFSDM_INTRG3
DFSDM_INTRG5 DFSDM_INTRG5
DFSDM_INTRG7 DFSDM_INTRG7
DFSDM_EXTRG0 DFSDM_EXTRG0
DFSDM_EXTRG1 DFSDM_EXTRG1
Table 122: DFSDM triggers
DocID024597 Rev 3
DFSDM2
DFSDM_INTRG0
DFSDM_INTRG1
DFSDM_INTRG2
DFSDM_INTRG3
DFSDM_INTRG5
DFSDM_INTRG8
DFSDM_EXTRG0
DFSDM_EXTRG1
connection.
RM0351
DFSDM3
DFSDM_INTRG0
DFSDM_INTRG1
DFSDM_INTRG2
DFSDM_INTRG4
DFSDM_INTRG6
DFSDM_INTRG8
DFSDM_EXTRG0
DFSDM_EXTRG1