P83C266BDR datasheet(56/92 Pages) PHILIPS

56 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

17.5.1.3

Space code 1 and Space code 2

If bits <11-5> hold 7FH, then this is a space code. One of

two space codes can be selected: Space code 1 and

Space code 2.

Space code 2 always displays a transparent pattern, equal

to one character width, on the screen regardless of which

primary mode and sub-mode is selected. Space code 1

only differs from Space code 2 when in the Box shadowing

sub-mode. In this mode SP1 displays a 12

× 18 dot matrix

pattern filled with the background colour whilst SP2

displays a transparent pattern. See Figs 37 and 38.

Selection of a specific space code is determined by the

state of bit 0 as detailed in Table 69.

Table 69 Selection of Space code

Bits <4-1> determine the background colour of the

characters that follow the space code dependent upon the

sub-mode selected, see Figs 35 and 36.

BIT 0

SPACE CODE

Space code 1 is selected.

Space code 2 is selected.

• In North-West shadowing sub-mode the background

colour is the colour of the bit pattern shadow

• In Box shadowing sub-mode the background colour is

the colour within the character 12

× 18 dot matrix where

no foreground character bits are present

• In the Superimpose sub-mode there is no background

colour

• In the Border shadowing sub-mode the background

colour is the colour of the border bit pattern.

17.5.1.4

Summary of CR, SP1 and SP2 functions

• Carriage Return code:

– Ends the current display row and uses the character

in the display RAM next to this CR code as the first

character of next display row

– Selects the character size of next display row

– Selects the character sub-mode of next display row

– Indicates the end of display for present screen.

• Space code 1 and Space code 2:

– Inserts transparent pattern in a row of characters

– Selects the background colour of the characters

following this space code.

Table 70 Format of Character font code

Table 71 Format of Carriage Return code

Table 72 Format of Space code

9876543210

Character Font code (00H to 7CH)

Foreground colour

Blink

9876543210

Carriage Return code (7EH)

Character size

Mode

End

9876543210

Space code 1 and Space code 2 (7FH)

Background colour

SP1

SP2

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