Philips Semiconductors
TV microcontroller with full screen
On Screen Display (OSD)
Preliminary specification
SAA5288
1 FEATURES
1.1 General
• On-chip TV control tuning
• Hardware and software compatible with SAA5290,
SAA5291 and SAA5296
• Single +5 V power supply
• RGB interface to standard decoder ICs, push-pull output
drive
• SDIP52 package
• Single crystal oscillator for display and microcontroller.
1.2 Microcontroller
• 80C51 microcontroller core
• 16 kbyte mask programmed ROM
• 256 bytes of microcontroller RAM
• Eight 6-bit Pulse Width Modulator (PWM) outputs for
control of TV analog signals
• One 14-bit PWM for Voltage Synthesis tuner control
• Four 8-bit Analog-to-Digital Converters (ADCs)
• 2 high current open-drain outputs for directly driving
LED’s etc.
• Switchable bit or byte-oriented I2C-bus interface.
1.3 Display
• Single page (1024 × 8) on-board On Screen Display
(OSD) memory
• Double size width and height capability for OSD
• Enhanced display features including meshing,
shadowing and additional display attributes
• 260 characters in mask programmed ROM
• Display clock derived internally to reduce peripheral
components to a minimum
• Automatic FRAME output control with manual override
• Standby mode for display hardware
• 525-line and 625-line display
• 12 × 10 character matrix
• Stable Display via slave synchronization to Horizontal
Sync and Vertical Sync.
2 GENERAL DESCRIPTION
The SAA5288 is a microcontroller for use in televisions
with an OSD generator compatible with the Economy
Teletext/TV microcontroller family (SAA5290, SAA5291,
SAA5296 etc.). TV control facilities are provided by an
on-chip industry standard 80C51 microcontroller and a
1 kbyte DRAM is included for OSD memory.
Hardware and software compatibility with the Economy
Teletext/TV microcontroller family minimizes the changes
required to develop a TV control function for areas where
teletext is not broadcast.
The device cannot acquire Teletext but is based on a
Teletext device. Therefore, throughout this document
references are made to Teletext especially when
describing the Display/OSD section. The Display/OSD
section is fully compatible with a Teletext display and has
all the features associated with Teletext (i.e. double
height/width, flash, teletext boxes, graphics, etc.).
The Display section is described with reference to Teletext
to allow software compatibility with the Economy
Teletext/TV microcontroller family.
3 QUICK REFERENCE DATA
SYMBOL
VDD
IDDM
IDDA
IDDT
fxtal
Tamb
PARAMETER
supply voltage (all supplies)
microcontroller supply current
analogue supply current
display supply current
crystal frequency
operating ambient temperature
MIN.
4.5
−
−
−
−
−20
TYP.
5.0
15
8
15
12
−
MAX.
5.5
30
15
30
−
+70
UNIT
V
mA
mA
mA
MHz
°C
1997 Jun 24
3