saa5647hl NXP Semiconductors, saa5647hl Datasheet - Page 36

• Manufacturer Part Number: saa5647hl
• Description: Saa56xx Enhanced Tv Microcontrollers With On-screen Display Osd
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8.7
The normal 80C51 external memory area has been
mapped internally to the device (see Fig.8). This means
that the MOVX instruction accesses memory internal to
the device.
2004 Sep 03
handbook, full pagewidth
Enhanced TV microcontrollers with
On-Screen Display (OSD)
(1) Both SAA56xx 128 and 192 kbytes have 12 kbytes of Display memory.
(2) 0800H to 1FFFH are mapped into 6 kbytes of Bank 0 of external RAM.
(3) Both SAA56xx 128 and 192 kbytes have 2 kbytes of Data RAM.
(4) Display RAM for Closed Caption and Text is shared.
An external RAM is required to be able to address this memory space (refer to Section 20 and Section 30.1).
MOVX memory
1FFFH
0800H
7FFFH
7000H
6FFFH
2000H
07FFH
0000H
TEXT PAGES
lower 32 kbytes
DISPLAY RAM
DATA RAM
(3)
FOR
(2)
(1)
Fig.8 MOVX RAM allocation.
FFFFH
9000H
8FFFH
8800H
87FFH
87E0H
871FH
8700H
845FH
8000H
DISPLAY REGISTERS
CLOSED CAPTION
upper 32 kbytes
DYNAMICALLY
REDEFINABLE
CHARACTERS
DISPLAY RAM
36
CLUT
FOR
8.7.1
The MOVX RAM page pointer is used to select one of the
256 pages within the MOVX address space, not all pages
are allocated, refer to Fig.9 for further detail. A page
consists of 256 consecutive bytes. XRAMP only works
with internal MOVX memory.
(4)
MOVX
address range 8460H to 84FFH
"Additional Internal Data RAM"
SPACE PAGE SELECTION
GSA021
Product specification
SAA56xx