1997 Mar 03

10

Philips Semiconductors

Objective specification

Stand-alone OSD for monitor applications

PCB8517

Table 16 Explanation of Table 15

Table 17 Column 10 of row 10

Table 18 Explanation of Table 17

A horizontal display line consists of 384 dots, which include 288 dots (e.g. 12 dots

× 24 characters) for display character,

and 96 dots for the blank region.

Table 19 Column 11 of row 10

Table 20 Explanation of Table 19

BIT

NAME

DESCRIPTION

5to0

−

These bits specify the vertical starting position of OSD. The counting starts from the

falling edge of the VFLB signal (e.g. enter vertical flyback period) and each increment

represents four scan line movement to the bottom. 64 positions are provided.

The default value is 4 after power-up. The time from the falling edge of the VFLB signal

to starting display is:

DATA BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

reserved

MSB

horizontal start position

LSB

BIT

NAME

DESCRIPTION

4to0

−

These bits specify the horizontal starting position of OSD. The counting starts from the

falling edge of the HFLB signal (e.g. enter horizontal flyback period) and each increment

represents six dots movement to the right. 32 positions are provided. The default value

is 15 after power-up. The time from the falling edge of the HFLB signal to starting

display is:

DATA BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

reserved

CH5

CH4

CH3

CH2

CH1

CH0

BIT

NAME

DESCRIPTION

5 to 0

CH5 to CH0

These bits specify the height of displayed characters. Table 21 shows the lines to be

repeated.

The height of character can be specified from 16 to 63 scan lines. For example, when

CH5 to CH0 = 00 0010, the height of character will be 18 scan lines, the 4th and 12th

line will be double scanned but others will be scanned once.