saa5647hl NXP Semiconductors, saa5647hl Datasheet - Page 66

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

Philips Semiconductors
23 DISPLAY
The display section (see Fig.25) is based on the
requirements for a Level 1.5 WST Teletext and US Closed
Caption. There are some enhancements for use with
locally generated on-screen displays.
The display section reads the contents of the Display
memory and interprets the control/character codes. From
this information and other global settings, the display
produces the required RGB signals and Video/Data (Fast
Blanking) signal for a TV signal processing device.
2004 Sep 03
handbook, full pagewidth
Enhanced TV microcontrollers with
On-Screen Display (OSD)
address
control
data
from memory interface
to memory interface
MICROPROCESSOR
INTERFACE
CHARACTER
SELECTOR
PHASE
DRCs
ROM
AND
address
data
12/24 MHz display
address
data
data
address
CLK
Fig.25 Display block diagram.
DISPLAY DATA ADDRESSING
FOR PAGE A AND PAGE B
FOR PAGE A AND PAGE B
FUNCTION REGISTERS
HSYNC
ADDRESSING
CHARACTER
DISPLAY
BUFFER
TIMING
FONT
DATA
data
66
The display is synchronized to the TV signal processing
device by horizontal and vertical sync signals from
external circuits (Slave Sync mode). All display timings are
derived from these signals.
The SAA56xx display section incorporates a number of
enhancements over the rest of the SAA55xx family,
including 100 Hz (2H/2V only) operation, two page mode
(50/60 Hz only), increased DRCS/Special Graphics and a
larger Character ROM.
VSYNC
PAGE B
GSA062
SMOOTHING AND FRINGING
DAC
FOR PAGE A AND PAGE B
R
ATTRIBUTE HANDLING
CONVERTER WITH
PARALLEL/SERIAL
CLUT RAM
DAC
G
Product specification
SAA56xx
DAC
B
FB