PIC16LC924-08/CL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC924-08/CL

8-Bit CMOS Microcontroller with LCD Driver

Microchip Technology 

13.2 LCD Interrupts

The LCD timing generation provides an interrupt that

defines the LCD frame timing. This interrupt can be

used to coordinate the writing of the pixel data with the

start of a new frame. Writing pixel data at the frame

boundary allows a visually crisp transition of the image.

This interrupt can also be used to synchronize external

events to the LCD. For example, the interface to an

external segment driver, such as a Microchip AY0438,

can be synchronized for segment data update to the

LCD frame.

PIC16C9XX

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

accessing all pixel data required for a frame. This will

occur at a certain fixed time before the frame boundary

as shown in Figure 13-9. The LCD controller will begin

to access data for the next frame within TFWR after the

interrupt.

FIGURE 13-9: EXAMPLE WAVEFORMS IN 1/4 MUX DRIVE

LCD

Interrupt

occurs

COM0

Controller accesses

next frame data

V3

V2

V1

V0

V3

COM1

V2

V1

V0

COM2

COM3

1 Frame

Frame

Boundary

TFWR = TFRAME/(LMUX1:LMUX0 + 1)

TFINT = (TFWR /2 - (2TCY + 40 ns)) → min.

(TFWR /2 - (1TCY + 40 ns)) → max.

V3

V2

V1

V0

V3

V2

V1

V0

TFINT

TFWR

Frame

Boundary

© 1997 Microchip Technology Inc.

DS30444E - page 97

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