5.0 Serial Programming Interface and Registers
5.4 Register Detail
Bt860/861
Multiport YCrCb to NTSC/PAL /SECAM
Register 1F
Default
Value
Register
1F
D7
D6
D5
D4
D3
D2
D1
D0
75
BURST_AMP[7:0]
BURST_AMP[7:0]
Multiplication Factor for the Colorburst Amplitude for NTSC/PAL
This register is ignored when using SECAM.
BURST_AMP = int {BURSTP–P × 210 / [(2 × 1.28 SincX + 0.5)]} if PAL = 0
BURST_AMP = int [0.707 × BURST P–P × 210 / (2 × 1.28 SincX + 0.5)] if PAL = 1
BURSTP–P = peak to peak burst amplitude in volts
SincX = Sin[(π × FSC / FCLK) / (π × FSC / FCLK)]
Register 20
Default
Value
Register
D7
D7
D7
D6
D5
D4
D3
D2
D1
D1
D1
D0
D0
D0
20
C1
M_CR[7:0]
Multiplication Factor for the Cr Component Prior to Modulation
M_CR[7:0]
This register is used for colorspace conversion and saturation adjustment.
V = (Cr – 128) × M_CR / 256
Register 21
Default
Value
Register
D6
D5
D4
D3
D2
21
89
M_CB[7:0]
Multiplication Factor for the Cb Component Prior to Modulation
M_CB[7:0]
This register is used for colorspace conversion and saturation adjustment.
U = (Cb – 128) × M_CB / 256
Register 22
Default
Value
Register
D6
D5
D4
D3
D2
22
9A
M_Y[7:0]
M_Y[7:0]
Luminance Multiplication Factor (contrast control)
M_Y ranges from 0–1.56, such that
M_Y[7:0] = 255 × multiplication factor
1.56
5-26
Conexant
D860DSA
CONEXANT [ CONEXANT SYSTEMS, INC ]
