Figure 62. Coordinates And Size Of The Window After Cropping; Figure 63. Data Capture Waveforms - ST STM32F207 Series Reference Manual

Advanced arm-based 32-bit mcus

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HOFFCNT bit in DCMI_CSTRT

These registers specify the coordinates of the starting point of the capture window as a line

number (in the frame, starting from 0) and a number of pixel clocks (on the line, starting from

0), and the size of the window as a line number and a number of pixel clocks. The CAPCNT

value can only be a multiple of 4 (two least significant bits are forced to 0) to allow the

correct transfer of data through the DMA.

If the VSYNC signal goes active before the number of lines is specified in the

DCMI_CWSIZE register, then the capture stops and an IT_FRAME interrupt is generated

when enabled.

1. Here, the active state of DCMI_HSYNC and DCMI_VSYNC is 1.

2. DCMI_HSYNC and DCMI_VSYNC can change states at the same time.

Figure 62. Coordinates and size of the window after cropping

VST bit in DCMI_CSTRT

Data not captured in this phase

Data captured in this phase

RM0033 Rev 9

CAPCNT bit in DCMI_CSIZE

Digital camera interface (DCMI)

VLINE bit in DCMI_CSIZE

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