ADE3700XT View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ADE3700XT Datasheet PDF : 89 Pages
| |||
Flicker
Row
0 to 14
0 to 14
Table 22: OSD Attribute Map Definition (Sheet 4 of 4)
Column
30
0 to 29
Bits
[7:3]
[2]
[1]
[0]
[7:5]
[4]
[3:0]
Description
Reserved
MSB of background color for the row
double high enable for the row
double wide enable for the row
3 LSBs of background color for 1bpp chars
no function for 4bpp color chars
blink enable
foreground color for 1bpp chars
for 4bpp color chars
[3:2]: Reserved
[1]: flip vertical
[0]: flip horizontal
ADE3700
Register Name
OSD_PORT
Table 23: OSD Register
Addr
0x0C02
Mode Bits
R/W
[7:0]
Default
(hex)
Description
0
OSD Access Port
2.16
Flicker
The Flicker block computes correlations of the image data with potential inversion patterns of the
LCD which in turn allows the microcontroller to modify the polarity signal to cancel large areas of
flicker. This function is only useful in SmartPanel applications.
The incoming image is scored against 8 vertical Walsh functions. All patterns are considered
vertically, while horizontally the pixels are assumed to be alternating RGB components.
The scores (0 to 7) are 32-bit unsigned quantities that reflect the correlation of the programmed
window area with the 8 Walsh functions.
The horizontal inversion of the LCD drivers must be programmed into FLICKER_CTRL0[2:0]. The
most common setting is +-+ or -+- (RGB).
A calculation is completed after the number of frames programmed into the FRAME_CNT_MAX
register (0xCA03). With each frame the calculation is performed on only a vertical strip. The width of
that strip (in pixels) is determined by the value programmed in the HBLOCK_SIZE register
(0xCA02) with the following relation: strip width = 2 ^ (3 + HBLOCK_SIZE).
The free_run/freeze_scores bit (FLICKER_CTRL0[4]) enables the final calculation to be captured
easily by the MCU. The internal flicker calculation continues to run -- only the update of the I2C
registers is blocked when this bit is set to prevent corruption during readout.
68/89
Share Link: 