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Circuit Descriptions, Abbreviation List, and IC Data Sheets

EN 67

LC4.7E AA

Figure 9-4 Micro Controller block diagram

9.9.3

Basic Specification

The Micro Controller operates at the following supply voltages:

•

+3.3 V

at pins 4, 88, 94, and 109.

•

+1.8 V

at pins 93, 96, and 117.

•

C pull up supply: +3.3 V

9.9.4

Pin Configuration and Functionality

The ports of the Micro Controller can be configured as follows:

•

A normal input port.

•

An input ADC port.

•

An output Open Drain port.

•

An output Push-Pull port.

•

An output PWM port.

•

Input/Output Port

The following table shows the ports used for the L04 control:

Table 9-1 Micro Controller ports overview

The description of each functional pin is explained below:

•

LED. This signal is used to drive the LED for Stand-by,
Remote, and Error Indication:

–

During protection mode, the LED blinks and the set is
in Stand-by mode.

–

During error conditions it blinks at a predefined rate.

–

After receiving a valid RC or local keyboard command
it flashes once.

–

For sets with error message indication, the LED blinks
when message is active and the set is in Stand-by
mode.

•

SCL. This is the clock wire of the two-wire single master bi-
directional I

C bus.

•

SDA. This is the data wire of the two-wire single master bi-
directional I

C bus.

•

STANDBY. The Hercules generates this signal. This can
enable the power supply in normal operation and disable it
during Stand-by. It is of logic “high” (3.3 V) under normal
operation and “low” (0 V) during Stand-by.

•

IR. This input pin is connected to an RC5 remote control
receiver.

•

SEL-IF. This is an output pin to switch the Video SAW filter
between M system and other systems.

–

0: NTSC M (default).

–

1: PAL B/G, DK, I, L.

•

NVM_WP. The global protection line is used to enable and
disable write protection to the NVM. When write to the NVM
is required, pin 7 of the NVM must be pulled to logic “0" first
(via Write_Protect of the micro-controller pin) before a write
is performed. Otherwise pin 7 of NVM must always be at
logic “1”

–

0: Disabled.

–

1: Enabled (default).

•

SOUND_ENABLE. This pin is use to MUTE the audio
amplifier. It is configured as push pull.

•

STATUS_1. This signal is used to read the status of the
SCART 1 input (EU only).

•

STATUS_2. This signal is used to read the status of the
SCART 2 input (EU only).

•

HERC_RESET. This pin is use to switch the +1.8 V supply.

•

POWER_DOWN. The power supply generates this signal.
Logic “high” (3.3 V) under normal operation of the TV and
goes “low” (0 V) when the Mains input voltage supply goes
below 70 V

•

KEYBOARD. Following are the Keyboard functions and
the step values (8 bit) for it.

Table 9-2 Local keyboard values

•

TV_IRQ. This signal is the interrupt from the Scaler IC.

•

TV_SC_COM. This signal is used for the communication
with the Scaler IC.

•

EXT_MUTE. This signal is used to reduce the switch “off”
plop.

Pin

Name

Description