RM0090: Reference manual - STMicroelectronics

Digital camera interface (DCMI) RM0090
8-bit data
When EDM[1:0] in DCMI_CR are programmed to “00” the interface captures 8 LSB’s at its
input (D[0:7]) and stores them as 8-bit data. The D[13:8] inputs are ignored. In this case, to
capture a 32-bit word, the camera interface takes four pixel clock cycles.
The first captured data byte is placed in the LSB position in the 32-bit word and the 4th captured data byte is placed in the MSB position in the 32-bit word. Table 60 gives an
example of the positioning of captured data bytes in two 32-bit words.
Table 60. Positioning of captured data bytes in 32-bit words (8-bit width)
Byte address 31:24 23:16 15:8 7:0
10-bit data
When EDM[1:0] in DCMI_CR are programmed to “01”, the camera interface captures 10-bit
data at its input D[0..9] and stores them as the 10 least significant bits of a 16-bit word. The
remaining most significant bits in the DCMI_DR register (bits 11 to 15) are cleared to zero.
So, in this case, a 32-bit data word is made up every two pixel clock cycles.
The first captured data are placed in the LSB position in the 32-bit word and the 2 nd
captured data are placed in the MSB position in the 32-bit word as shown in Table 61.
12-bit data
When EDM[1:0] in DCMI_CR are programmed to “10”, the camera interface captures the
12-bit data at its input D[0..11] and stores them as the 12 least significant bits of a 16-bit
word. The remaining most significant bits are cleared to zero. So, in this case a 32-bit data
word is made up every two pixel clock cycles.
The first captured data are placed in the LSB position in the 32-bit word and the 2 nd
captured data are placed in the MSB position in the 32-bit word as shown in Table 62.
14-bit data
0 D n+3[7:0] D n+2[7:0] D n+1[7:0] D n[7:0]
4 D n+7 [7:0] D n+6 [7:0] D n+5 [7:0] D n+4 [7:0]
Table 61. Positioning of captured data bytes in 32-bit words (10-bit width)
Byte address 31:26 25:16 15:10 9:0
0 0 D n+1 [9:0] 0 D n [9:0]
4 0 D n+3[9:0] 0 D n+2[9:0]
Table 62. Positioning of captured data bytes in 32-bit words (12-bit width)
Byte address 31:28 27:16 15:12 11:0
0 0 D n+1[11:0] 0 D n[11:0]
4 0 D n+3 [11:0] 0 D n+2 [11:0]
When EDM[1:0] in DCMI_CR are programmed to “11”, the camera interface captures the
14-bit data at its input D[0..13] and stores them as the 14 least significant bits of a 16-bit
329/1416 Doc ID 018909 Rev 3