MITSUBISHI MICROCOMPUTERS
M37274EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
(2) Sync Slice Circuit
(1) Clamping Circuit and Low-pass Filter
This filter attenuates the noise of the composite video signal input
from the CVIN pin. The CVIN pin to which composite video signal is
input requires a capacitor (0.1 µF) coupling outside. Pull down the
CVIN pin with a resistor of hundreds of kiloohms to 1 M . In addition,
we recommend to install externally a simple low-pass filter using a
resistor and a capacitor at the CVIN pin (refer to Figure 25).
This circuit takes out a composite sync signal from the output signal
of the low-pass filter. Figure 25 shows the structure of the sync slice
register.
Sync Slice Register
b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
1
0
1
Sync slice register (SSL) [Address 00E316
]
R
R
W
W
B
Name
Functions
After reset
0
0, 2
Fix these bits to “1.”
1,
3 to 6
0
0
R
R
W
W
Fix these bits to “0.”
7
Vertical synchronous
signal (Vsep) generating
method selection bit
(SSL7)
0: Method 1
1: Method 2
Fig. 35. Sync Slice Register
40
RENESAS [ RENESAS TECHNOLOGY CORP ]
