1997 Mar 03

7

Philips Semiconductors

Objective specification

Stand-alone OSD for monitor applications

PCB8517

Table 3

Display buffers; see Table 4

Table 4

Explanation of Table 3

DATA BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

CCS0

CA6

CA5

CA4

CA3

CA2

CA1

CA0

BIT

NAME

DESCRIPTION

7

CCS0

This bit defines the characters colour. When the character has no window background

with it, colour 0 is selected if CCS0 = 0, otherwise colour 1 is selected. When the

character is inside a window and the CCS1 bit of the corresponding windows control

register is 0, the colour selection is the same as no window background, and if

CCS1 = 1, colour 2 is selected when CCS0 = 0, otherwise colour 3 is selected.

6 to 0

CA6 to CA0

These 7 bits define 1 of 128 character symbols to be displayed in this position.

Fig.4 Internal RAM map.

handbook, full pagewidth

WINDOW 1

CONTROL

ROW

CHARACTER DISPLAY BUFFERS

RESERVED

COLUMN

ROW

CONTROL

0

9

10

0

2

35

68

9

12 13

31

MGD763

23

0

24

29

30

31

WINDOW 2

CONTROL

WINDOW 3

CONTROL

FRAME

CONTROL

RESERVED