October 1994

26

Philips Semiconductors

Product specification

8-bit microcontrollers with OSD and VST

84C44X; 84C64X; 84C84X

12.6.4

Table 21 Derivative register OSDCB (address 43H)

Table 22 Description of OSDCB bits

REGISTER

FUNCTION

OSDCB

Determine the selection of:

• The size of the dot matrix grid

• Four colours from a possible seven for the display.

7

6

5

4

3

2

1

0

CDTW

CDTH

CC33

CC23

CC32

CC12

CC21

CC11

BIT SYMBOL

FUNCTION

7

CDTW

Character dot width control.The state of this bit determines the dot width of the character. When

the CDTW bit is set to:

Logic 1, the character width is 6 dots.

Logic 0, the character width is 8 dots.

6

CDTH

Character dot height control. The state of this bit determines the dot height of the character. When

the CDTH bit is set to:

Logic 1, the character height is 13 dots.

Logic 0, the character height is 9 dots.

5

CC33

Colour control bits.

In every VSYNCN cycle one screen can select any 4 colours from 7 and in addition a blank or black

screen. Combinations of CC1X, CC2X and CC3X control the character outputs VOW1, VOW2 and

VOW3 as shown in Table 24.

4

CC23

3

CC32

2

CC12

1

CC21

0

CC11