VS6624P0LP datasheet(17/100 Pages) STMICROELECTRONICS

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VS6624

Clock control

Rev 1

17/100

Clock control

Input clock

The VS6624 requires provision of an external reference clock. The external clock should be

a DC coupled square wave. The clock signal may have been RC filtered. The clock input is

fail-safe in power down mode.

The VS6624 contains an internal PLL allowing it to produce accurate frame rates from a

wide range of input clock frequencies. The allowable input range is from 6.5MHz to 54MHz.

The input clock frequency must be programmed in the registers. To program an input

frequency of 6.5 MHz, the numerator can be set to 13 and the denominator to 2. The default

input frequency is 12 MHz.

The VS6624 may be configured as a master or slave device. In normal (master operation)

the input clock can be a different frequency to the output PCLK and all output clock

configuration is based on the internal PLL. In slave configuration, the input clock is the same

frequency and phase as the output PCLK. i.e. parallel output data is synchronized to the

input clock.

VS6624P0LP bảng dữ liệu(PDF) 17 Page - STMicroelectronics