PCE84C886 datasheet(21/56 Pages) PHILIPS

21 / 56 page

1996 Jan 08

Philips Semiconductors

Preliminary speciﬁcation

Microcontroller for monitor OSD

and auto-sync applications

PCE84C886

10.1.1

CHARACTER FONT CODE

If bits <9-4> are in the range (00H to 3DH), then this is a

Character Font Code and 1 from 62 customer designed

character fonts can be selected. Bits <3-1> determine the

colour of the character, a choice of 8 colours being

available. Bit <0> determines whether the character blinks

or not. The format of the Character Font Code is shown in

Table 5.

Table 8

Selection of Foreground colour

Table 9

Selection of Blinking function

10.1.2

CARRIAGE RETURN CODE

If bits <9-4> hold 3EH, then this is the Carriage Return

Code. The current display line is terminated (a transparent

pattern appears on the screen) and the next character will

be displayed at the beginning of the next line. Bits <3-2>

select the size of the of the character to be displayed on

the next line. Bits <1-0> determine the spacing between

lines of displayed characters. Spacing is a multiple of the

number of horizontal scan lines. In order to prevent vertical

jumping of the display, the first line should be a

non-displayed line i.e. the Carriage Return Code. The line

spacing for this code must not be zero (see Table 11). The

format of the Carriage Return Code is shown in Table 6.

(RED)

(GREEN)

(BLUE)

COLOUR

black

blue

green

cyan

100

red

magenta

yellow

white

BLINKING

OFF

1ON

Table 10 Selection of character size

Note

1. H is the OSD clock period; V is the number of

horizontal scan lines per dot.

Table 11 Selection of line spacing

10.1.3

SPACE CODE

If bits <9-4> hold 3FH, then this is the Space Code. A

transparent pattern, equal to one character width, will be

displayed on the screen. Bits <3-1> determine the

background colour of the characters including the Space

Code in Box shadowing mode but following the Space

Code in North shadowing mode. See Sections 12.4 and

12.3.1 for more details. Background colour selection is the

same as foreground colour selection. Bit <0> is the

End-of-Display bit and indicates the end of display of the

current screen before exhaustion of display RAM (i.e.

before the 64th RAM location). The format of the Space

Code is shown in Table 7.

Table 12 End of display control

CHARACTER DOT SIZE(1)

1H/1V

1H/2V

1H/3V

1H/4V

LINE SPACING

0H line

4H line

8H line

12H line

DISPLAY CONTROL

continue display of next character; this

is also the default setting

end of display

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