1996 Nov 29

28

Philips Semiconductors

Product specification

8-bit microcontrollers with OSD and VST

84C44X; 84C64X; 84C84X

12.8

OSD character size and colour selection

12.8.1

The character sizes are determined by the bits:

• CDTW, for the width

• CDTH, for the height.

The character sizes are selected by bits SZn1 and SZn0,

which denotes:

• SZ01 and SZ00 for Row 0

• SZ11 and SZ10 for Row 1.

Table 23 Character sizes selection

H denotes one horizontal line, T denotes one OSDC clock period and D denotes dots per character width/height.

SIZE BITS

CHARACTER SIZE

DOT MATRIX POINT

SZn1

SZn0

VERTICAL

HORIZONTAL

VERTICAL

HORIZONTAL

9D

13D

6D

8D

0

0

18H

26H

12T

16T

2H

2T

0

1

36H

52H

24T

32T

4H

4T

1

0

54H

78H

36T

48T

6H

6T

1

1

72H

104H

48T

64T

8H

8T

12.8.2

Colour selection is achieved using bits in the,

• OSDCA register: CC34, CC24 and CC14

• OSDCB register: CC33, CC23, CC32, CC12,

CC21, and CC11

• Display data registers: CC1 and CC0.

In this way every combination of four colours can be made

(black and white can not be displayed at the same time).

The user may choose one colour out of each block.

Table 24 shows the selection of the output combinations.

Tables 25 and 26 show the possible colour combinations.

Fig.27 Colour control.

handbook, full pagewidth

CHARACTER ROM

DISPLAY DATA

MEMORY

DISPLAY CIRCUIT

CONTROL REGISTERS

VOW3

VOB

OR

CC1

CC0

CCxx

dot

background control

VOW2

VOW1

MCD184

OUTPUT

CONTROL

LOGIC