ST7669 datasheet(39/216 Pages) SITRONIX

39 / 216 page

ST7669

Ver 1.3a

39/216

3/2/2009

7.3.8

Tearing Effect Output Line

The Tearing Effect output line supplies to the MPU a Panel synchronization signal. This signal can be enabled or disabled

by the Tearing Effect Line Off & On commands. The signal can be used by the MPU to synchronize Frame Memory Writing

when displaying video images.

Tearing Effect Line Modes

1 st line

2 nd line

3 rd line

162th line

( mode1)

( mode2)

tHDH

tHCYC

20 line

142th line

COM scan

internal signal

tHDH

tVDH

t CYCLE

142 line

162line

20 line

142 line

162 line

FRAME

Frame1

Frame2

Mode 1, the Tearing Effect Output signal consists of V-Sync(tVDH) information. It starts at 142

th line signal and ends at the

162

th line signal. There is one high pulse during each frame.

Mode 2, the Tearing Effect Output signal consists of both H-Sync(tHDH) and V-Sync(tVDH) information. TE pin output

tHDH pulse on each COM scan signal. During 142

th ~ 162th line signal, it output a high pulse which equals 1 tHDH + 1

tVDH.

Note: During Sleep In Mode, the Tearing Effect Output Pin is active Low.

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