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18.3.1
Dot Clock Control
Dot clock control allows selection of external dot clock input or internal VCO generation
dot clock input. Commands 17-0, 17-1 and 18-0 to 18-3 enable dot clock control.
■ Input Dot Clock Selection Control
Table 18.3-1 shows the dot clock selection control of dot clock control 1 (command 17-0): Bit
DCK. To use the internal VCO generation dot clock, specify VCO-related control of commands
18-0 to 18-13 and then use this command to select the input dot clock.
Table 18.3-1 Dot Clock Selection Control
DCK
0
1
■ External Dot Clock Input
The OSDC inputs a clock signal from an external oscillator.
The clock signal is assumed to be synchronized with the input horizontal sync signal.
Dot clock control
External dot clock input (initial state)
Internal VCO generation dot clock input
CHAPTER 18 OSDC
543
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