SAA5531 Philips Semiconductors, SAA5531 Datasheet - Page 76

• Manufacturer Part Number: SAA5531
• Description: Enhanced TV microcontrollers with On-Screen Display OSD
• Manufacturer: Philips Semiconductors

Philips Semiconductors
19.11 ROM addressing
Three ROMs are used to generate the correct pixel information. The first contains the National option look-up table, the
second contains the Basic Character look-up table and the third contains the Character Pixel information.
Although these are individual ROMs, since they do not need to be accessed simultaneously they are all combined into
a single ROM unit.
2000 Feb 23
handbook, full pagewidth
Enhanced TV microcontrollers with
On-Screen Display (OSD)
BASIC + NATIONAL OPTION
CHARACTER PIXEL DATA
430 TEXT
2048 LOCATIONS
(71680
LOOK-UP
710 TEXT
OR
12-BIT)
176 CC
Fig.36 ROM organisation.
2400H
0800H
0000H
76
LOOK-UP SET 3
LOOK-UP SET 2
LOOK-UP SET 1
LOOK-UP SET 0
MBK978
0800H
0600H
0400H
0200H
0000H
Preliminary specification
SAA55xx