SAA5531 Philips Semiconductors, SAA5531 Datasheet - Page 30

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

Philips Semiconductors
8.7
The normal 80C51 external memory area has been
mapped internally to the device, this means that the MOVX
instruction accesses memory internal to the device.
2000 Feb 23
Enhanced TV microcontrollers with
On-Screen Display (OSD)
(1) Amount of Data RAM depends on device.
(2) Amount of Display RAM depends on the device.
(3) Display RAM for Closed Caption and Text is shared.
External (Auxiliary) memory
handbook, halfpage
7FFFH
4800H
47FFH
2000H
07FFH
0000H
TEXT PAGES
lower 32 kbytes
DISPLAY RAM
DATA RAM
Fig.10 Auxiliary RAM allocation.
FOR
(1)
(2)
30
8.7.1
The Auxiliary RAM page pointer is used to select one of
the 256 pages within the Auxiliary RAM, not all pages are
allocated; refer to Fig.11 for further detail. A page consists
of 256 consecutive bytes.
FFFFH
8C00H
8BFFH
8800H
87FFH
87F0H
871FH
8700H
84FFH
8460H
845FH
8000H
ADDITIONAL DATA RAM
DISPLAY REGISTERS
CLOSED CAPTION
DYNAMICALLY
upper 32 kbytes
REDEFINABLE
CHARACTERS
DISPLAY RAM
A
UXILIARY
CLUT
FOR
RAM
GSA084
(3)
PAGE SELECTION
Preliminary specification
SAA55xx