24
Microprocessor Pin-outs
Pin Designation I/O
Purpose
1 P2.0/TPWM
O
Tuning
PWM
2
P2.1/PWM0
O
Text contrast PWM
3
P2.2/PWM1
O
AV audio control: high = AV2, low = RGB/AV1
4 P2.3/PWM2
O
!
FM/AM source select (low = AM)
5 P2.4/PWM3
O
!
SCART/internal sound select (low = internal sound)
6 P2.5/PWM4
O
!
L’ control select (active high)
7
P2.6/PWM5
O
Pseudo line drive
8
P2.7
O
Force RGB high = RGB mode
9
P3.0/ADC0
AV1 SCART pin 8 level detection (ADC)
10
P3.1/ADC1
AV1 SCART pin 16 level detection (ADC)
11
P3.2/ADC2
AGC level sampling (ADC)
12 P3.3
–
13
Vssd
Digital ground
14
P0.0
I
High band tuner select (active low)
15
P0.1
I
Mid band tuner select (active low)
16
P0.2
I
Low band tuner select (active low)
17
P0.3
O
Audio mute control (active low
18 P0.4
I
Select
key
19 P0.5
I
Down
key
20 P0.6
I
Up
key
21 P0.7
–
22
Vssa
Analogue ground
23
CVBS0
I
Composite video
24
CVBS1
–
25
Black
I
Video black level storage
26
Iref
I
Reference current
27
Frame
–
28
Test
Ground
29
COR
–
30
P3.4
TDA884X Line drive gating: high in standby & start-up, low in operation
31
RGBref
I
RGB reference
32
OSD B
O
Blue OSD
33
OSD G
O
Green OSD
34
OSD R
O
Red OSD
35
OSD EN
O
OSD enable
36
H sync
I
Horizontal sync
37
V sync
I
Vertical sync
38
Vdda
+5V display power supply
39
Vddt
+5V display power supply
40
Osc gnd
Crystal oscillator ground
41
Osc in
I
12MHz crystal oscillator
42
Osc out
O
12MHz crystal oscillator
43
Reset
I
Reset (active high)
44
Vddm
+5V microcontroller power supply
45 P1.0/Int1
I
Remote
control
46
P1.1/T0
O
Standby/IR LED: low = LED bright, high = LED dim
47
P1.2/Int0
I
Line drive from TDA884x
48
P1.3/T1
O
Standby control (active low)
49 P1.6/SCL
I²C
clock
50 P1.7/SDA
I²C
data
51
P1.4
I
Service mode (active low)
52
P1.5
I
Halt microcontroller control (active low)
NOTE
!
!
!
!
Only used on French chassis
Table 5
Pin
Descriptions
