Digital camera interface (DCMI) RM0390
436/1328 RM0390 Rev 4
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. OELS LSM OEBS BSM[1:0]
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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Res. ENABLE Res. Res. EDM[1:0] FCRC[1:0] VSPOL HSPOL PCKPOL ESS JPEG CROP CM CAPTURE
rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:21 Reserved, must be kept at reset value.
Bit 20 OELS: Odd/Even Line Select (Line Select Start)
This bit works in conjunction with LSM field (LSM = 1)
0: Interface captures first line after the frame start, second one being dropped
1: Interface captures second line from the frame start, first one being dropped
Bit 19 LSM: Line Select mode
0: Interface captures all received lines
1: Interface captures one line out of two.
Bit 18 OEBS: Odd/Even Byte Select (Byte Select Start)
This bit works in conjunction with BSM field (BSM <> 00)
0: Interface captures first data (byte or double byte) from the frame/line start,
second one being dropped
1: Interface captures second data (byte or double byte) from the frame/line start,
first one being dropped
Bits 17:16 BSM[1:0]: Byte Select mode
00: Interface captures all received data
01: Interface captures every other byte from the received data
10: Interface captures one byte out of four
11: Interface captures two bytes out of four
Note: This mode only work for EDM[1:0]=00. For all other EDM values, this bit
field must be programmed to the reset value.
Bit 15 Reserved, must be kept at reset value.
Bit 14 ENABLE: DCMI enable
0: DCMI disabled
1: DCMI enabled
Note: The DCMI configuration registers should be programmed correctly before
enabling this Bit
Bits 13:12 Reserved, must be kept at reset value.
Bits 11:10 EDM[1:0]: Extended data mode
00: Interface captures 8-bit data on every pixel clock
01: Interface captures 10-bit data on every pixel clock
10: Interface captures 12-bit data on every pixel clock
11: Interface captures 14-bit data on every pixel clock
Bits 9:8 FCRC[1:0]: Frame capture rate control
These bits define the frequency of frame capture. They are meaningful only in
Continuous grab mode. They are ignored in snapshot mode.
00: All frames are captured
01: Every alternate frame captured (50% bandwidth reduction)
10: One frame in 4 frames captured (75% bandwidth reduction)
11: reserved
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