INTEDG datasheet(363/478 Pages) MICROCHIP

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 2010-2012 Microchip Technology Inc.

DS41414D-page 363

PIC16(L)F1946/47

27.12 LCD Interrupts

The LCD module provides an interrupt in two cases. An

interrupt when the LCD controller goes from active to

inactive controller. An interrupt also provides unframe

boundaries for Type B waveform. The LCD timing gen-

eration provides an interrupt that defines the LCD

frame timing.

27.12.1

LCD INTERRUPT ON MODULE

SHUTDOWN

An LCD interrupt is generated when the module

completes shutting down (LCDA goes from ‘1’ to ‘0’).

27.12.2

LCD FRAME INTERRUPTS

A new frame is defined to begin at the leading edge of

the COM0 common signal. The interrupt will be set

immediately after the LCD controller completes access-

ing all pixel data required for a frame. This will occur at

a fixed interval before the frame boundary (TFINT), as

shown in Figure 27-19. The LCD controller will begin to

access data for the next frame within the interval from

the interrupt to when the controller begins to access

data after the interrupt (TFWR). New data must be writ-

ten within TFWR, as this is when the LCD controller will

begin to access the data for the next frame.

When the LCD driver is running with Type-B waveforms

and the LMUX<1:0> bits are not equal to ‘00’ (static

drive), there are some additional issues that must be

addressed. Since the DC voltage on the pixel takes two

frames to maintain zero volts, the pixel data must not

change between subsequent frames. If the pixel data

were allowed to change, the waveform for the odd

frames would not necessarily be the complement of the

waveform generated in the even frames and a DC

component would be introduced into the panel.

Therefore, when using Type-B waveforms, the user

must synchronize the LCD pixel updates to occur within

a subframe after the frame interrupt.

To correctly sequence writing while in Type-B, the

interrupt will only occur on complete phase intervals. If

the user attempts to write when the write is disabled,

the WERR bit of the LCDCON register is set and the

write does not occur.

Note:

The LCD frame interrupt is not generated

when the Type-A waveform is selected

and when the Type-B with no multiplex

(static) is selected.

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