MC44BS373CA Data Sheet
I2C Bit Mapping
9 I2C Bit Mapping
Table 8. I2C Write-Mode Bit Mapping
Write Mode
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ACK
Chip address
1
0
1
0
ACK
C1—High-order bits
1
0
SO
LOP
PS
X3
X2
SYSL
ACK
C0—Low-order bits
PWC
OSC
ATT
SFD1
SFD0
SREF
X5
X4
ACK
FM—High-order bits
0
TPEN
N11
N10
N9
N8
N7
N6
ACK
FL—Low-order bits
N5
N4
N3
N2
N1
N0
X1
X0
ACK
Table 9. I2C Read-Mode Bit Mapping
Read Mode
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ACK
Chip address
11
001
1
ACK
R—Status byte
—
————
Y2
Y1
OOR
—
Table 10. I2C Bit Mapping Bit Descriptions
Name
Description
SO
Sound oscillator on/off
0 Sound oscillator on (normal mode)
1 Sound oscillation disabled (oscillator and PLL section bias turned off)
LOP
Logic output port
0 LOP pin is low voltage.
1 LOP pin is high impedance.
PS
Picture-to-sound carrier ratio
0 Picture-to-sound carrier ratio is 12 dB.
1 Picture-to-sound carrier ratio is 16 dB.
X0–X5
Test mode bits
Note: All bits are 0 for normal operation. For further information, see
Table 17 and
Table 18.
SYSL
System L enable—Selects AM sound and positive video modulation
0 System B /G enabled, system L disabled (FM sound and negative video modulation)
1 System L enabled, system B/G disabled (AM sound and positive video modulation)
PWC
Peak white clip enable/disable
0 Peak white clip on (system B/G)
1 Peak white clip off (system L)
OSC
UHF oscillator on/off
0 Normal operation
1 UHF oscillator disabled (oscillator and PLL sections bias turned off)
ATT
Modulator output attenuated-sound and video modulators on/off
0 Normal operation
1 Modulator output attenuation (sound and video modulators sections bias turned off)