mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 1006

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

LCD Controller
18.3.9.1 SINGLE-SCAN AND DUAL-SCAN PANELS. Some LCD panels split the display
area into two horizontal halves that are scanned at the same time so that two lines are
shifted and displayed simultaneously in each half. In this case, half of the data bus is used
to drive the upper half of the screen and the other half is used to drive the lower half.
Figure 18-10 illustrates single-scan and dual-scan LCD panels.
18.3.9.2 PASSIVE INTERFACE. Passive LCD interfaces use the following signals. These
signals have a programmable polarity. T
T
A general-purpose I/O can be used to output an integrated signal or pulse-width modulation
(PWM) waveform and its duty cycle controls the RMS value of the voltage to the panel. The
PWM signal is generated by one of the communication processor module timers. Refer to
Section 16.2.6 RISC Microcontroller Commands for more details.
delay
DATA (4 OR 8 BITS)
• SHIFT/CLK—On the asserted edge of SHIFT, data is latched into the X shift register.
• FRAME/VSYNC—The FRAME signal initiates the frame by putting the Y pointer at the
• LOAD/HSYNC—The LOAD signal transfers the contents of the shift register into the
• LCD_AC/LOE—The LCD alternating current signal toggles every few frames to nullify
• LD—The width of this data bus is configured to 4 or 8 bits.
first row.
drive latches.
any DC voltage. The toggle rate is programmable.
FRAME, LOAD
is a circuit delay.
SHIFT, LOAD
Figure 18-10. Single-Scan and Dual-Scan LCD Panels
Y
Freescale Semiconductor, Inc.
For More Information On This Product,
SINGLE-SCAN DISPLAY
X BY Y PIXELS
MPC823 REFERENCE MANUAL
ARRAY
Go to: www.freescale.com
X
cyc
is the cycle time of the LCD clock (SHIFT/CLK).
DATA (2 OR 4 BITS)
DATA (2 / 4 BITS)
FRAME, LOAD
SHIFT, LOAD
Y
DUAL-SCAN DISPLAY
X BY Y / 2 PIXELS
0 BY Y / 2 PIXELS
ARRAY
ARRAY
MOTOROLA
0
X