7220 Datasheet, PDF (215/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
5.5 Example of I²C-BUS control by software (M37220M3-XXXSP/FP)
s DELAY ADJ
This adjusts the RF AGC delay point. The output level of tuner decreases when the value
increase, the output level increases when the value decreases.
s POS/NEG
This switch sets the VIF output signal to either the positive or the negative modulation signal.
When “0,” the negative modulation signal is selected; when “1,” the positive modulation signal is
selected.
s VCO ADJ
This register changes the free running frequency of VIF VCO. The frequency increases when the
value increases, the frequency decreases when the value decreases.
s A MUTE
This is the audio mute ON/OFF.
s 4.5/6.0
This bit must be set to “1” when the sound carrier frequency is 4.5 MHz. Set “0” when the
frequency is other values.
s DFA, DL TIME
In order to adjust the color signal and the luminance signal is delayed using the on-chip delay-line.
The DL TIME register adjusts the delay approximately, and the DFA register performes the fine
adjustments. When DFA is “1,” actual delay time is +50 ns; when “0,” it is +0 ns. For relationship
between DFA and DL TIME, refer to “Table 5.5.9.”
Table 5.5.9 Relationship between DFA and DL TIME
Data
0
1
2
3
4
5
6
7
DL
TIME1
0
0
0
0
1
1
1
1
DL
TIME0
0
0
1
1
0
0
1
1
DFA
0
1
0
1
0
1
0
1
Actual
delay time
170 ns
120 ns
330 ns
280 ns
410 ns
360 ns
490 ns
440 ns
s DBF
The M52340SP has 2 TRAP; the second TRAP extends the bandwidth of the TRAP, described
below. DBF is the ON/OFF switch for the second TRAP. When “1,” it is on; when “0,” it is off. DBF
is used in SECAM and other methods.
s TRAP
This is the TRAP ON/OFF switch for taking out the luminance signal (Y-signal) by Y/C separation
(Y = Y-signal, C = color signal) of the composite video signal. When “1,” it is on; when “0,” it is
off.
s AUDIO ATT
Data is set (“0” to “127”) to change the volume.
5-42
7220 Group User’s Manual