SPEAR300 datasheet(22/83 Pages) STMICROELECTRONICS

22 / 83 page

Architecture overview

SPEAr300

22/83

Doc ID 16324 Rev 2

2.20

Keyboard controller

SPEAr300 provides a GPIO/keyboard controller block which is a two-mode input and output

port.

Main features:

●

The selection between the two modes is an APB Bus programmable bit.

●

Keyboard interface uses 18 pins

●

18-bit general-purpose parallel port with input or output single pin programmability

●

Pins can be used as general purpose I/O or to drive a 9 x 9 keyboard (81 keys)

●

Keyboard scan period can be adjusted between 10 ms and 80 ms

●

Supports auto-scanning with debouncing.

2.21

CLCD controller

SPEAr300 has a color liquid crystal display controller (CLCDC) that provides all the

necessary control signals to interface directly to a variety of color and monochrome LCD

panels.

Main features:

●

Resolution programmable up to 1024 x 768

●

16-bpp true-color non-palletized, for color STN and TFT

●

24-bpp true-color non-palletized, for color TFT

●

Supports single and dual panel mono super twisted nematic (STN) displays with 4 or 8-

bit interfaces

●

Supports single and dual-panel color and monochrome STN displays

●

Supports thin film transistor (TFT) color displays

●

15 gray-level mono, 3375 color STN, and 32 K color TFT support

●

1, 2, or 4 bits per pixel (bpp) palletized displays for mono STN

●

1, 2, 4 or 8-bpp palletized color displays for color STN and TFT

●

Programmable timing for different display panels

●

256 entry, 16-bit palette RAM, arranged as a 128 x 32-bit RAM physically frame, line

and pixel clock signals

●

AC bias signal for STN and data enable signal for TFT panels patented gray scale

algorithm

●

Supports little and big-endian

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