ARM Technical Support Knowledge Articles

What is the purpose of the Bypass Pixel Clock Divider field (BCD) in the Timing2 register?

Applies to: PL111 Colour LCD Controller


The BCD field is provided as an *option* to maintain a 1:1 CLCDCLK:CLCP clock ratio if that's what's wanted, 
or needed, by the LCD panel. This option is only really used for TFT displays. 
Should it be that the CLCP clock needs to run slower than CLCDCLK then the Panel Clock Divider (PCD) will 
need to be used and the BCD field must be set to '0' to avoid bypassing the PCD.

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