- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
195
12.2.4.
Line lock mode (LL)
Line lock mode is a type of external synchronization in which the camera’s vertical phase is synchronized to
the AC power supply. The power supply frequency is 60Hz for NTSC and 50Hz for PAL.
The SGMODE setting is 1[h] (see
The SGMODE LSB is set as a port driver function to P10 (pin 78) under the CXD3172AR initial settings.
Therefore, to set line lock mode under the CXD3172AR initial conditions (when there are no valid data in the
EEPROM), set the CXD3172AR’s P10 (pin 78) to High.
Table 12.2-12 TV systems and supply frequencies
TV system
Line lock supply frequency
NTSC 60Hz
PAL 50Hz
System configuration
The line lock mode master signal is the power supply square wave. A power supply square wave (3.3V
amplitude/digital signal), obtained by waveform-rectifying the AC power supply, is input to S0 (pin 44).
In addition, in line lock mode, a 27.000MHz clock is used as the input to ECK (pin 88). The MODESEL
(operation mode setting) settings in this case are shown in
. Typically LC oscillation is used as the
MCK VCO. The subcarrier is free-run.
* When the 760H CCD is used to run line lock mode, the following MODESEL settings are removed from the
specifications.
MODESEL=6[h],7[h] : NTSC
MODESEL=9[h] : PAL
Table 12.2-13 MODESEL settings (ECK-27.000MHz)
MODESEL
(CAT12_Byte1_bit0-3)
TV system
CCD Type
8[h] NTSC
B[h] PAL
760H
* Note that with the above MODESEL settings, the subcarrier is free-run even in internal mode (INT).