mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 120

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

5.3.4.4 THE LCD CLOCKS. The LCD clocks—LCDCLK and LCDCLK50—are used by the
LCD controller circuitry to transfer the frame data to pixel format data. LCDCLK defaults to
VCOOUT, which is the user-defined system frequency (25-75MHz).When the PON bit in the
LCCR is set, the ratio between the system clock frequency value and the LCD clock
frequency value must be an integer value. The LCD clock frequency is the system frequency
divided by two serial dividers. LCDCLK50 is a 50% duty-cycle clock at the same frequency
as LCDCLK that is used as a clock output to the LCD panel. DFLCD and DFALCD must be
set so that the total LCD clock division factor never exceeds 64.
The LCDCLK and LCDCLK50 frequency is:
LCDCLK
freq
VCOOUT
=
LCDCLK50
GCLK2 DIVIDE BY 1
LCDCLK DIVIDE BY 1
LCDCLK50 DIVIDE BY 1
GCLK2 DIVIDE BY 2
LCDCLK DIVIDE BY 2
LCDCLK50 DIVIDE BY 2
GCLK2 DIVIDE BY 4
LCDCLK DIVIDE BY 4
LCDCLK50 DIVIDE BY 4
freq
DFLCD
Freescale Semiconductor, Inc.
=
Figure 5-14. LCD Clock Timing Diagram
For More Information On This Product,
------------------------------------------------------------------------------------- -
2
DFLCD
Figure 5-13. LCDCLK Divider
MPC823 REFERENCE MANUAL
VCOOUT
Go to: www.freescale.com
2 DFALCD + 1
freq
DFALCD
LCDCLK50
LCDCLK
Clocks and Power Control
CONTROLLER
LCD/VIDEO
LCD PANEL
5-21