10
Plasma TV Service Manual
14/03/2005
12.6.4. 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.
12.7.
SAA5264
12.7.1. 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
2
C-bus gives easy control with a low software overhead
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.
12.7.2. 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.
12.7.3. Pin Connections and Short Descriptions
SYMBOL
PIN
TYPE
DESCRIPTION
Port 2: 8-bit programmable bidirectional port with alternative functions
P2.0/PWM
1
I/O
output for 14-bit high precision Pulse Width Modulator (PWM)
P2.1/PWM0
2
I/O
outputs for 6-bit PWMs 0 to 6
P2.2/PWM1
3
I/O
P2.3/PWM2
4
I/O
P2.4/PWM3
5
I/O
P2.5/PWM4
6
I/O
P2.6/PWM5
7
I/O
P2.7/PWM6
8
I/O
Port 3: 8-bit programmable bidirectional port with alternative functions
P3.0/ADC0
9
I/O
inputs for the software Analog-to-Digital-Converter (ADC) facility
P3.1/ADC1
10
I/O
Summary of Contents for HPT-4205
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Page 56: ...54 Plasma TV Service Manual 14 03 2005 15 CIRCUIT DIAGRAMS...
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