7220 Datasheet, PDF (216/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
5.5 Example of I²C-BUS control by software (M37220M3-XXXSP/FP)
s SHARPNESS, CONTRAST, TINT, COLOR, BRIGHT
Data is set to change the picture data.
Some TVs have a picture mode function (such as the movie mode, standard mode), the fixed data
is set according to the mode. Accordingly, it is necessary to change the picture data when changing
the picture mode.
s DEFEAT
This switch turns DEFEAT off when AFT is on, and vice versa.
s TV/EXT
This selects either a TV’s signal or an external device’s signal. This bit should be set to “0” when
TV’s signal is selected and set to “1” when an external device’s signal is selected.
s AUTO
This determines whether the automatic determination of the color system is used or not. When
AUTO is “0,” manual determination is set; when “1,” determination is performed automatically.
s 3.58/NTSC/SECAM
When setting AUTO (bit 5 at sub-address 0616, write data) to “1,” these bits are automatically set
inside the M52340SP. When setting AUTO to “0,” it is necessary to set the data shown in Table
5.5.10, according to the color system.
Table 5.5.10 Setting of color system (at sub-address
0916, write data)
Color system
D2
D1
D0
3.58
NTSC SECAM
PAL
0
0
0
SECAM
0
0
1
NTSC3.58
1
1
0
NTSC4.43
0
1
0
s H PHASE
The picture’s horizontal position is adjusted. Data is given every 50 Hz or 60 Hz and the data is
set when frequency changes. For wide TVs etc., data is given for each screen size mode, and the
data is set when the screen size mode changes.
s DRIVE R, DRIVE B
Data is used to adjust the output amplitude ratio of R, G and B signals. Since G is the fixed data,
its ratio is adjusted by R and B.
s MUTE
This is the video mute ON/OFF switch.
s CUT OFF R, CUT OFF G, CUT OFF B
Data is used to adjust the output DC level of R, G and B signals.
s F TRAP
This register performes the fine adjustments to the trap frequency of TRAP for Y/C separation.
7220 Group User’s Manual
5-43