Datasheet

37. Image Sensor Interface (ISI)
37.1 Description
The Image Sensor Interface (ISI) connects a CMOS-type image sensor to the processor and provides image capture
in various formats. The ISI performs data conversion, if necessary
, before the storage in memory through DMA.
The ISI supports color CMOS image sensor and grayscale image sensors with a reduced set of functionalities.
In Grayscale mode, the data stream is stored in memory without any processing and so is not compatible with the
LCD controller.
Internal FIFOs on the preview and codec paths are used to store the incoming data. The RGB output on the preview
path is compatible with the LCD controller. This module outputs the data in RGB format (LCD compatible) and has
scaling capabilities to make it compliant to the LCD display resolution (see the table RGB Format in Default Mode,
RGB_CFG = 00, No Swap).
Several input formats such as preprocessed RGB or YCbCr are supported through the data bus interface.
The ISI supports two synchronization modes:
• Hardware with ISI_VSYNC and ISI_HSYNC signals
• International Telecommunication Union Recommendation ITU-R BT.656-4 Start-of-Active-Video (SAV) and End-
of-Active-Video (EAV) synchronization sequence
Using EAV/SAV for synchronization reduces the pin count (ISI_VSYNC, ISI_HSYNC not used). The polarity of the
synchronization pulse is programmable to comply with the sensor signals.
Table 37-1. I/O Description
Signal Direction Description
ISI_VSYNC In Vertical Synchronization
ISI_HSYNC In Horizontal Synchronization
ISI_DATA[11..0] In Sensor Pixel Data
ISI_MCK Out Master Clock provided to the Image Sensor. Refer to “Clocks”.
ISI_PCK In Pixel Clock provided by the Image Sensor
Figure 37-1. ISI Connection Example
Image Sensor Image Sensor Interface
data[11..0]
ISI_DATA[11..0]
CLK
ISI_MCK
PCLK
ISI_PCK
VSYNC
HSYNC
ISI_VSYNC
ISI_HSYNC
SAM E70/S70/V70/V71 Family
Image Sensor Interface (ISI)
© 2019 Microchip T
echnology Inc.
Datasheet
DS60001527D-page 528