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ADE3800 数据表(PDF) 71 Page - STMicroelectronics |
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ADE3800 数据表(HTML) 71 Page - STMicroelectronics |
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71 / 138 page  71/138 ADE3800 Register Description by Block 4.13 Gamma (GAM) The Gamma block implements three independent 256 point gamma curves for each of R, G, and B channels. Its features are as follows: ● 256x8b table per color channel stores 2’s complement difference to straight line ● 10b input/output (0 to 1023), range of delta = -128 to +127 (+/- 1/8 th full scale) ● double LUT amplitude control to change range to 2 x (delta = -256 to +254) ● fast write mode for loading 3 tables with the same data ● glitch free write mode ● clipping on output to [0,1023] ● programmable offset_value added from offset_position0 to offset_position1 (inclusive). gamma_out_r = gamma_in_r + lut_r + (offset_position0 <= gamma_in_r <= offset_position1) ? offset_value: 0 gamma_out_g = gamma_in_g + lut_g + (offset_position0 <= gamma_in_g <= offset_position1) ? offset_value: 0 gamma_out_b = gamma_in_b + lut_b + (offset_position0 <= gamma_in_b <= offset_position1) ? offset_value: 0 Table 28: Gamma Registers I2C Address Label Addr Mode Bits Rst Description GAM_CTRL 0C00 R/W [3] 00 0*: delta range = -128 to +127 1: delta range = -256 to +254 [2] 0*: i2c to RAM transfer at selected i2c address only 1: i2c to RAM transfer the same value to Red, Green, and Blue RAMs when selecting Red RAM addresses [1] 0*: Write i2c to RAM allowed during active video 1: Write i2c to RAM during video blanking only (shadowed) [0] 0*: gamma bypassed 1: gamma enabled GAM_POSITION0 0C01 R/W [7:0] 00 IF (gamma_in/4 >= offset_position0 && gamma_in/4 <= offset_position1) THEN offset = offset_value * 16 ELSE offset = 0 (gamma_out = gamma_in + lut + offset) GAM_POSITION1 0C02 R/W [7:0] 00 See offset_position0 for details GAM_OFFSET 0C03 R/W [5:0] 00 Multipled by 16. 2’s complement number represents –512 to +496 inclusive. See offset_position0 for details |
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