PEDL87V21071-01
OKI Semiconductor
ML87V21071
e Judging noise status detection
Judgment of the noise status is achieved by comparing the average noise value (YAVRO[6:0], CAVRO[6:0]),
the noise status comparison value (I2C-bus setting registers YAVR1[5:0] (SUB:53h-bit[5:0]), CAVR1[5:0]
(SUB:54h-bit[5:0]), YAVR2 [6:0] (SUB:55h-bit[6:0]), CAVR2[6:0] (SUB:56h-bit[6:0])). Based on this
judgment, the noise status signals (YDTO1, CDTO1, YDTO2, CDTO2) are generated.
The detection of noise status signal has a hysteresis characteristic as shown in Figure F2-1-6 (5). Select the
characteristic with YAH1 (SUB:53h-bit[7]), CAH1 (SUB:54h-bit[7]), YAH2 (SUB:55h-bit[7]), and CAH2
(SUB:56h-bit[7]).
It is also possible to mask the luminance detection in order to enable chrominance detection by setting ACY
(SUB:49h-bit[2]. The chrominance detection is enabled when YDTO1 = 1 for CDTO1 and YDTO2 = 1 for
CDTO2.
Table F2-1-7 (10) Luminance Judgment Noise Status Detection 1
Before transition
After transition
Condition
YDTO1
YDTO1
0
0
YAVRO[6:0] ≤ YAVR1[5:0]
0
1
YAVRO[6:0] > YAVR1[5:0]
YAVRO[6:0] ≤ YAVR1[5:0] x (hysteresis
coefficient)
1
0
YAVRO[6:0] > YAVR1[5:0] x (hysteresis
coefficient)
1
1
Table F2-1-7 (11) Chrominance Judgment Noise Status Detection 1
Before transition
After transition
Condition
CDTO1
CDTO1
0
0
CAVRO[6:0] ≤ CAVR1[5:0]
0
1
CAVRO[6:0] > CAVR1[5:0]
CAVRO[6:0] ≤ CAVR1[5:0] x (hysteresis
coefficient)
1
0
CAVRO[6:0] > CAVR1[5:0] x (hysteresis
coefficient)
1
1
Table F2-1-7 (12) Luminance Judgment Noise Level Detection 2
Before transition
After transition
Condition
YDTO2
YDTO2
0
0
0
1
YAVRO[6:0] ≤ YAVR2[6:0]
YAVRO[6:0] > YAVR2[6:0]
YAVRO[6:0] ≤ YAVR2[6:0] x (hysteresis
coefficient)
YAVRO[6:0] > YAVR2[6:0] x (hysteresis
coefficient)
1
1
0
1
Table F12-1-7 (13) Chrominance Judgment Noise Status Detection 2
Before transition
After transition
Condition
CDTO2
CDTO2
0
0
CAVRO[6:0] ≤ CAVR2[6:0]
0
1
CAVRO[6:0] > CAVR2[6:0]
CAVRO[6:0] ≤ CAVR2[6:0] x (hysteresis
coefficient)
1
0
CAVRO[6:0] > CAVR2[6:0] x (hysteresis
coefficient)
1
1
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