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Color Liquid Crystal Display Controller
13.3.3 CLCDC Interrupts
The single combined interrupt, CLCDINTR, is used to drive the Vectored Interrupt
Controller (VIC). If any of the four interrupt conditions occurs, this signal is asserted.
CLCDINTR drives the VIC.
Each of the four individual maskable interrupt conditions is enabled or disabled by chang-
ing the mask bits in the INTRENABLE Register. Provision of individual outputs, along with
a combined interrupt output, allows the use of either a global interrupt service routine or
modular device drivers to handle interrupts. The status of the individual interrupt sources
can be read from the Status Register.
13.4 HR-TFT Controller
The HR-TFT Controller (HRTFTC) is used with the CLCDC and accessed via an AMBA
APB interface. The HRTFTC is designed to be supplied with the standard TFT output from
the LCD Controller and produce the necessary control and data signals to interface to an
HR-TFT–type display.
13.4.1 HRTFTC Operating Modes
The HRTFTC has two operating modes: Bypass Mode or HR-TFT Mode. The Setup Reg-
ister setting specifies the operating mode of the HRTFTC (see Section 13.4.5.1).
13.4.1.1 Bypass Mode
Bypass Mode is the default mode after a System Reset. In this mode, the input signals
from the CLCDC are passed directly to the output pins without any signal reformatting. This
mode should be used when the LCD Controller is required to operate in normal TFT Mode
or when using the LCD Controller in STN Mode.
13.4.1.2 HR-TFT Mode
In HR-TFT Mode, TFT data and the control signals from the LCD Controller generate a set
of signals for driving an HR-TFT display. HR-TFT Mode also re-times the data to the falling
edge of the output clock. The formatter provides the scanning signals for vertical and hor-
izontal scanning. It also generates the source driver, gate driver, and voltage preparation
control signals.
13-24
LH75400/01/10/11 (Preliminary) User's Guide
7/15/03
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