Saa5264 - Toshiba 27WLT56B Service Manual

12.3.4. Functional Descriptions
The 24C32A supports a Bi-directional 2-wire bus and data transmission protocol. A device that sends
data onto the bus is defined as transmitter, and a device receiving data as receiver. The bus must be
controlled by a master device which generates the Serial Clock (SCL), controls the bus access, and
generates the START and STOP conditions, while the 24C32A works as slave. Both master and slave
can operate as transmitter or receiver but the master device determines which mode is activated.

SAA5264

12.4.
12.4.1. Features
The following features apply to both SAA5264 and SAA5265:
•
Complete 625 line teletext decoder in one chip reduces printed circuit board area and cost
•
Automatic detection of transmitted fastext links or service information (packet 8/30)
•
On-Screen Display (OSD) for user interface menus using teletext and dedicated menu icons
•
Video Programming System (VPS) decoding
•
Wide Screen Signalling (WSS) decoding
•
Pan-European, Cyrillic, Greek/Turkish and French/Arabic character sets in each chip
• High-level command interface via I
•
High-level command interface is backward compatible to Stand-Alone Fastext And Remote Interface
(SAFARI)
•
625 and 525 line display
•
RGB interface to standard colour decoder ICs, current source
•
Versatile 8-bit open-drain Input/Output (I/O) expander, 5 V tolerant
• Single 12 MHz crystal oscillator
•
3.3 V supply voltage.
SAA5264 features
•
Automatic detection of transmitted pages to be selected by page up and page down
•
8 Page fastext decoder
•
Table Of Pages (TOP) decoder with Basic Top Table (BTT) and Additional Information Tables (AITs)
•
4 Page user-defined list mode.
12.4.2. General Description
The SAA5264 is a single-chip ten page 625-line World System Teletext decoder with a high-level
command interface, and is SAFARI compatible.
The device is designed to minimize the overall system cost, due to the high-level command interface
offering the benefit of a low software overhead in the TV microcontroller.
The SAA5264 has the following functionality:
• 10 page teletext decoder with OSD, Fastext, TOP, default and list acquisition modes
• Automatic channel installation support
• Closed caption acquisition and display
• Violence Chip (VChip) support.
12.4.3. Pin Connections and Short Descriptions
SYMBOL PIN
Port 2: 8-bit programmable bidirectional port with alternative functions
P2.0/PWM 1
P2.1/PWM0 2
P2.2/PWM1 3
P2.3/PWM2 4
P2.4/PWM3 5
P2.5/PWM4 6
P2.6/PWM5 7
P2.7/PWM6 8
Port 3: 8-bit programmable bidirectional port with alternative functions
P3.0/ADC0 9
P3.1/ADC1 10
27" TFT TV Service Manual
C-bus gives easy control with a low software overhead
2
TYPE DESCRIPTION
I/O
output for 14-bit high precision Pulse Width Modulator (PWM)
I/O outputs for 6-bit PWMs 0 to 6
I/O
I/O
I/O
I/O
I/O
I/O
I/O inputs for the software Analog-to-Digital-Converter (ADC) facility
I/O
8
05/09/2005