Datasheet

SAM9G20
DS60001516A-page 696  2017 Microchip Technology Inc.
The RGB 5:6:5 input format is processed to be displayed as RGB 5:5:5 format, compliant with the 16-bit mode of the LCD controller.
38.3.3 Clocks
The sensor master clock (ISI_MCK) can be generated either by the Advanced Power Management Controller (APMC) through a Program-
mable Clock output or by an external oscillator connected to the sensor.
None of the sensors embeds a power management controller, so providing the clock by the APMC is a simple and efficient way to control
power consumption of the system.
Care must be taken when programming the system clock. The ISI has two clock domains, the system bus clock and the pixel clock pro-
vided by sensor. The two clock domains are not synchronized, but the system clock must be faster than pixel clock.
38.3.4 Preview Path
38.3.4.1 Scaling, Decimation (Subsampling)
This module resizes captured 8-bit color sensor images to fit the LCD display format. The resize module performs only downscaling. The
same ratio is applied for both horizontal and vertical resize, then a fractional decimation algorithm is applied.
The decimation factor is a multiple of 1/16 and values 0 to 15 are forbidden.
RGB 5:6:5
Byte 0 R4(i) R3(i) R2(i) R1(i) R0(i) G5(i) G4(i) G3(i)
Byte 1 G2(i) G1(i) G0(i) B4(i) B3(i) B2(i) B1(i) B0(i)
Byte 2 R4(i+1) R3(i+1) R2(i+1) R1(i+1) R0(i+1) G5(i+1) G4(i+1) G3(i+1)
Byte 3 G2(i+1) G1(i+1) G0(i+1) B4(i+1) B3(i+1) B2(i+1) B1(i+1) B0(i+1)
Table 38-4: RGB Format, RGB_CFG = 10 (Mode 2), No Swap
Mode Byte D7 D6 D5 D4 D3 D2 D1 D0
RGB 5:6:5
Byte 0 G2(i) G1(i) G0(i) R4(i) R3(i) R2(i) R1(i) R0(i)
Byte 1 B4(i) B3(i) B2(i) B1(i) B0(i) G5(i) G4(i) G3(i)
Byte 2 G2(i+1) G1(i+1) G0(i+1) R4(i+1) R3(i+1) R2(i+1) R1(i+1) R0(i+1)
Byte 3 B4(i+1) B3(i+1) B2(i+1) B1(i+1) B0(i+1) G5(i+1) G4(i+1) G3(i+1)
Table 38-5: RGB Format in Default Mode, RGB_CFG = 00, Swap Activated
Mode Byte D7 D6 D5 D4 D3 D2 D1 D0
RGB 8:8:8
Byte 0 R0(i) R1(i) R2(i) R3(i) R4(i) R5(i) R6(i) R7(i)
Byte 1 G0(i) G1(i) G2(i) G3(i) G4(i) G5(i) G6(i) G7(i)
Byte 2 B0(i) B1(i) B2(i) B3(i) B4(i) B5(i) B6(i) B7(i)
Byte 3 R0(i+1) R1(i+1) R2(i+1) R3(i+1) R4(i+1) R5(i+1) R6(i+1) R7(i+1)
RGB 5:6:5
Byte 0 G3(i) G4(i) G5(i) R0(i) R1(i) R2(i) R3(i) R4(i)
Byte 1 B0(i) B1(i) B2(i) B3(i) B4(i) G0(i) G1(i) G2(i)
Byte 2 G3(i+1) G4(i+1) G5(i+1) R0(i+1) R1(i+1) R2(i+1) R3(i+1) R4(i+1)
Byte 3 B0(i+1) B1(i+1) B2(i+1) B3(i+1) B4(i+1) G0(i+1) G1(i+1) G2(i+1)
Table 38-3: RGB Format in Default Mode, RGB_CFG = 00, No Swap