STV9937 datasheet(34/49 Pages) STMICROELECTRONICS

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Picture BooSTTM

STV9937

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7.4

Line and Pixel Offsets

Due to the intrinsic delay on the RGB channel during the RGB decoding, 2 offsets can be applied for

fine tuning as shown in below:

Note:It is recommended to adjust the pixel offset each time the monitor resolution changes.

7.5

PLL Synchronised

The STV9937 PLL can either be synchronized on the HFLY or HSYNC signals.

WARNING:Once synchronized on HFLY, the Picture BooSTTM feature cannot be guaranteed.

HFLYP

The HFLYP bit configures the polarity of the HFLY signal

0: Falling edge active (default value)

1: Rising edge active

OSDREF

The OSDREF selects the signal taken as reference

0: HFLY is the reference (default value)

1: HSYNC is the reference

ENPB

The ENPB bit selects Picture BooSTTM decoding

0: The RGB video inputs are not decoded, there is no possibility of displaying the PB.

The user can write X1/X2 Y1/Y2 coordinates in the registers, but the On/Off bit is

inactive (default value)

1: PB decoding is active and the PB display can be made active with the PBON bit

PBON

The PBON bit selects Picture BooSTTM display

0: PB is not displayed (default value)

1: PB is displayed on the screen with the coordinates written in the X/Y registers

PBVM

The PBVM bit selects the Picture BooSTTM interface

0: Interface via RGB (default value)

1: Interface via I²C

Bits

Description

OFFSETLIN[1:0]

The line offset in SIGNED radix is coded on 2 bits from -2 to +1. Default value is 0.

OFFSETPIX[5:0]

The pixel offset in SIGNED radix is coded on 6 bits from -32 to +31. Default value is 0.

Bit

Description

HMUX

0: HSYNC is the synchronization signal

1: HFLY is the synchronization signal

Table 37: PictureBooSTTM Configuration

Bit

Description

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