Digital Camera Interface (Dcmi); Dcmi Introduction; Dcmi Main Features; Dcmi Pins - ST STM32F40 Series Reference Manual

RM0090
13

Digital camera interface (DCMI)

This section applies to the whole STM32F4xx family devices, unless otherwise specified.
13.1

DCMI introduction

The digital camera is a synchronous parallel interface able to receive a high-speed data flow
from an external 8-, 10-, 12- or 14-bit CMOS camera module. It supports different data
formats: YCbCr4:2:2/RGB565 progressive video and compressed data (JPEG).
This interface is for use with black & white cameras, X24 and X5 cameras, and it is assumed
that all pre-processing like resizing is performed in the camera module.
13.2

DCMI main features

●
8-, 10-, 12- or 14-bit parallel interface
●
Embedded/external line and frame synchronization
●
Continuous or snapshot mode
●
Crop feature
●
Supports the following data formats:
–
–
–
–
13.3

DCMI pins

Table 60
Table 60.
D[0:13]
HSYNC
VSYNC
PIXCLX
13.4

DCMI clocks

The digital camera interface uses two clock domains PIXCLK and HCLK. The signals
generated with PIXCLK are sampled on the rising edge of HCLK once they are stable. An
enable signal is generated in the HCLK domain, to indicate that data coming from the
camera are stable and can be sampled. The maximum PIXCLK period must be higher than
2.5 HCLK periods.
8/10/12/14- bit progressive video: either monochrome or raw bayer
YCbCr 4:2:2 progressive video
RGB 565 progressive video
Compressed data: JPEG
shows the DCMI pins.
DCMI pins
Name
Data inputs
Horizontal synchronization input
Vertical synchronization input
Pixel clock input
Doc ID 018909 Rev 4
Digital camera interface (DCMI)
Signal type
330/1422