PCB8517 查看數據表（PDF） - Philips Electronics
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PCB8517 Datasheet PDF : 24 Pages
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Philips Semiconductors
Stand-alone OSD for monitor applications
Objective specification
PCB8517
Table 16 Explanation of Table 15
BIT
5 to 0
NAME
−
DESCRIPTION
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:
tv = (vertical start position) × 4 × th-sync + th-sync.
Where th-sync = one horizontal line display time.
Table 17 Column 10 of row 10
BIT 7
BIT 6
reserved
BIT 5
DATA BYTE
BIT 4
BIT 3
BIT 2
BIT 1
MSB
horizontal start position
BIT 0
LSB
Table 18 Explanation of Table 17
BIT
4 to 0
NAME
−
DESCRIPTION
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:
th = (horizontal start position) × 6 × tdot + 61 × tdot.
Where tdot = one pixel display time (e.g. one horizontal line display time/384).
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
BIT 7
BIT 6
reserved
BIT 5
CH5
DATA BYTE
BIT 4
CH4
BIT 3
CH3
BIT 2
CH2
BIT 1
CH1
BIT 0
CH0
Table 20 Explanation of Table 19
BIT
5 to 0
NAME
DESCRIPTION
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.
1997 Mar 03
10
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