(No.YA654<Rev.001>)1-7
2.2.2 SUB MICRO COMPUTER (CPU) FUNCTION [SIGNAL PWB:
IC2501
]
Pin
No.
Pin name
I/O
Function
1
P9_4
-
Not used
2
P9_3
-
Not used
3
P9_2
-
Not used
4
P9_1
-
Not used
5
P9_0
-
Not used
6
BYTE
I
Data bus width select [L fixed]
7
CNVSS
I
CPU mode select [Normal = L]
8
P8_7
-
Not used
9
XRES
I
Not used
10
RESET
I
CPU reset [Reset = L]
11
XOUT
O
Oscillation for system clock
12
VSS
-
GND
13
XIN
I
Oscillation for system clock
14
VCC1
-
+3.3V power supply
15
NMI
I
Non-maskable interrupt [H fixed]
16
MCU_RESET2
I
Interrupt detection for 24V power supply [Error = L]
17
POWER_KEY
I
Interrupt detection for mecanical POWER SW [On = L]
18
IR_33
I
Remote control
19
P8_1
-
Not used
20
P8_0
-
Not used
21
LED_DIMMING
O
Brightness control for POWER LED [Bright = H]
22
LED_ON
O
Lighting for POWER LED [On = H]
23
AC_IN
I
Not used
24
ILLUMI_ON
O
Not used
25
VGA_DET
I
Not used
26
ILL_DIMMING
O
Not used
27
RX_NF
I
Not used
28
TX_NF
O
Not used
29
TXD1
O
Data transmission (serial) for external programming
30
RXD1
I
Data receive (serial) for external programming
31
CLK1
I/O
Clock for external programming
32
RTS1
O
Busy for external programming
33
MCU_TXD
O
Serial data transmission for main CPU
34
MCU_RXD
I
Serial data receive for main CPU
35
P6_1
-
Not used
36
P6_0
-
Not used
37
P5_7
-
Not used
38
P5_6
-
Not used
39
HOLD
I
CPU mode select [L fixed]
40
P5_4
-
Not used
41
P5_3
-
Not used
42
P5_2
-
Not used
43
P5_1
-
Not used
44
P5_0
-
Not used
45
P4_7
-
Not used
46
P4_6
-
Not used
47
NF_CNTL2
I
Not used
48
NF_CNTL1
I
Not used
49
P4_3
-
Not used
50
P4_2
-
Not used
51
EDID_WP
O
Programming control for EDID ROM [Protection = H]
52
NF_PPON
O
Not used
53
NF_OC
O
Not used
54
DET_NF
I
Not used
55
PFC_POW
O
Power on/off control for PFC [On = L]
56
CTL_SW
O
Not used
57
HP_DET
I
Not used
58
HP_WDOG
I
Watch dog reset for main CPU
59
P3_1
-
Not used
60
VCC2
-
+3.3V power supply
61
P3_0
-
Not used
62
VSS
-
GND
63
RESET_TU
O
Reset for tuner [Reset = L]
64
VCCH_RST
O
Reset for Vcch of main CPU [Reset = L]
65
RESET%_TRIDENT
O
Reset for main cpu & flash memory [Reset = L]
66
RESET_STV8258
O
Not used
67
S_MUTE
O
Speaker output muting [Muting = H]
68
A_MUTE
O
Audio line output muting [Muting = H]
69
HP_MUTE
O
Not used
70
MAIN_POWER
O
Power on/off control for main power supply [On = L]
71
P1_7
-
Not used
72
P1_6
-
Not used
73
P1_5
-
Not used
74
BKLT_CNTL
O
Not used
75
P1_3
-
Not used
76
REG_SW1
O
Power on/off control for regulator IC [On = H]
77
REG_SW2
O
Power on/off control for regulator IC [On = H]
78
REG_SW3
O
Power on/off control for regulator IC [On = H]
79
P0_7
-
Not used
80
P0_6
-
Not used
81
SDA_EEP
I/O
I
2
C bus (data) for EEPROM
82
SCL_EEP
O
I
2
C bus (clock) for EEPROM
83
P0_3
-
Not used
84
P0_2
-
Not used
85
P0_1
-
Not used
86
P0_0
-
Not used
87
P10_7
-
Not used
88
P10_6
-
Not used
89
P10_5
-
Not used
90
P10_4
-
Not used
91
LB_PRO
I
Low-B protect detection [Error protection = H]
92
P10_2
-
Not used
93
KEY2
I
Side key scan voltage (MENU/CH+/CH-)
94
AVSS
-
GND
95
KEY1
I
Side key scan voltage (INPUT/VOL+/VOL-)
96
VREF
I
Reference voltage [H fixed]
97
AVCC
-
+3.3V power supply
98
P9_7
-
Not used
99
P9_6
-
Not used
100
P9_5
-
Not used
Pin
No.
Pin name
I/O
Function
