STV9410 datasheet(11/25 Pages) STMICROELECTRONICS

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2.3 CLOCK AND TIMING GENERATOR

The whole timing is derived from XTI input fre-

quency which can be an external generator or a

crystal signal thanks to XTO/XTI oscillator.This

clock is also pixel frequency which can be chosen

between 8MHz to 10MHz (pxlck). This clock is

available on CKO pin. It should be use for the MCU,

saving a crystal in the application.

The active area of a video line is 320 pixels periods

long (40 characters of 8 pixels wide). Number of

lines per frame, margin width, line duration, leading

and trailing edges of horizontal synchronizationare

fully programmable in CRT mode using VERT,

HORI, HSYN registers.

A RESET, can be applied to STV9410 by pulling

low VREF pin (

≤ 0.4V).

On RESET, default values are forced into configu-

ration registers and video outputs are at low level.

All unused bit of registers are always read as ”0”.

2.3.1 Time Base Registers

Vertical Time Base and Configuration

Internal address : 2FF1-2FF0 h

RESET value :01-36 h

(@ = RESET default configuration)

2FF1 h LCD ILC

C/H

V/P VSE HSE

0000

2FF0 h

0011

LCD

1 LCD mode

0 CRT mode @

ILC

1 Interlaced scanning

0 non-interlaced scanning @

C/H

1 CSYNC is composite synchro

0CSYNC is horizontal synchro @

V/P

1 VSYNC is vertical synchro

0VSYNC is RTP bit of current descriptor @

VSE

1 enable vertical synchro with SYNC IN

0 disable @

HSE

1 enable horizontal synchro with SYNC IN

0 disable @

F (8:0)

scan line number per frame (@ 312)

LCD

ILC

C/H

V/P

VSE HSE

XXXXXX

000000

0000

Not al lowed

100

120

240

250

310

312

313

320

480

512

513

000

110

F(0:8) + 2

Nb of S can

Lines

LS B

HEXA

2FF0

2FF1

F[8:0] = Scan Line Number - 2

262

263

Figure 6 : Vert Register Scan Lines Programmation

STV9410

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