Ports; Μ-Controller I/O Pin Configuration And Function Table; Tuning - Daewoo DTF-2950-100D Service Manual

Attenuation Measurement and Compensation
Group Delay Measurement and Compensation
Exact Decoding of Echo Disturbed Signals

5.5.3 PORTS

One 8-bit I/O-port with open drain output and optional I 2 C Bus emulation support (Port 0)
Two 8-bit multifunction I/O-ports (Port 1, Port 3)
One 4-bit port working as digital or analogue inputs for the ADC (Port 2)
One 2-bit I/O-port with secondary functions (P4.2, 4.3, 4.7)
5.5.4 μ-CONTROLLER I/O PIN CONFIGURATION AND FUNCTION TABLE
PIN NAME
S/SW2
3
S/SW2
4
OCP
5
RESET out
8
S/SW1
15
AGC in
16
KEY
17
AFT
18
Mod SW
21
SECAM L'
22
IR
23
SOUND INT
24
Sound Mute
47
AGC out
48
Relay
50
LED
51
Power
52

5.5.5 TUNING

The AFC information is supplied by the demodulator IC, and becomes available on SDA55xx pin
15 for controlling software. The controlling software uses this information for tuner frequency
tracking ( automatic following ). The AFC windows is typically between 50 KHz and 100 KHz. The
minimum frequency step of the tuner is 50 Khz.
This AFC function is disabled when a program is tuned using the direct frequency entry or after
fine tuning adjustment. Therefore it is recommended to tune channel with the TV search function
( manual or ATSS ) or using the direct channel entry to enable the Automatic Frequency Control.
Europe R&D
Downloaded From TV-Manual.com Manuals
CONFIGURATION
STAND BY
Open Drain
Open Drain
Open Drain
Low
High impedance High impedance
High impedance High impedance
High impedance High impedance
High impedance High impedance
High impedance
High impedance
High impedance High impedance
Input
Push Pull - Low Push Pull - High
--
Push Pull - Low Push Pull - High
Push Pull
Push Pull - Low Push Pull - High
TV ON
Open Drain
Open Drain
Open Drain Over Current Protection
Open Drain Reset video IC's
ADC input
AGC input – ADC input
Keyboard input – ADC input
AFT input– ADC input
High = Negative modulation, Low =
Push Pull
Positive modulation (L/L').
Push Pull Low = L, High =L'
Infrared Interrupt input
Sound interrupt input – edge
input
triggered
Low=Mute
PWM out Control tuner AGC (TOP)
Low : LED Red
Push Pull
High : LED Green
SMPS operation mode
High=ON, Low=ST-BY
CP-850FX Service Manual
DESCRIPTION
#4 #3 Source
L L Tuner
L H AV2-16/9
H L AV2-4/3
H H AV2-4/3
55