RM0319 datasheet(271/368 Pages) STMICROELECTRONICS

271 / 368 page

RM0319

LCD display controller (CLCD)

Doc ID 022640 Rev 3

271/368

Number of colors supported for mono STN panels are:

●

1 bpp, palettized, 2 gray scales selected from 15

●

2 bpp, palettized, 4 gray scales selected from 15

●

4 bpp, palettized, 16 gray scales selected from 15

You can program greater than four bpp for mono panels but using these modes does not

make sense because the maximum number of gray scales supported on the display is 15.

24.3

Pins

The CLCD directly interfaces with the signals summarized in Table 75.

Table 75.

CLCD signal interface

The CLLP, CLAC, CLFP, CLCP and CLLE signals are common, but the CLD[23:0] bus has

eight modes of operation:

●

TFT 24-bit interface

●

TFT 18-bit interface

●

color STN single panel

●

color STN dual panel

●

4-bit mono STN single panel

●

4-bit mono STN dual panel

●

8-bit mono STN single panel

●

8-bit mono STN dual panel

Group

Signal name

Direction

Size

(bit)

Description

External

(to chip pads)

CLAC

Output

STN AC bias drive or TFT data enable

output

CLCP

Output

LCD panel clock

CLD[23:0]

Output

LCD panel data

CLFP

Output

Frame pulse (STN)/vertical synchronization

pulse (TFT)

CLLE

Output

Line end signal

CLLP

Output

Line synchronization pulse (STN)/horizontal

synchronization pulse (TFT)

CLPOWER

Output

LCD panel power enable

Control signal

CLCD_INTR

Output

Combined OR version CLCD interrupt

requests, to interrupt controller.

AHB slave

Input/Output -

See AMBA specification.

AHB master

Input/Output -

See AMBA specification.

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