Panasonic KX-TCD420RUT / KX-A142RUT Service Manual ▷ View online
23 CIRCUIT OPERATION (CHARGER UNIT)
23.1. Power Supply Circuit
The power supply is as shown.
24 SIGNAL ROUTE
61
KX-TCD420RUT / KX-A142RUT
25 CPU DATA (BASE UNIT)
25.1. IC8 (BBIC)
Pin
Descriptiojn
I/O
Hi
Hi-z
Low
Remarks
1
VSS
-
-
-
-
2
DM1
DI
-
-
-
for Down Load
3
DM2
DI
-
-
-
for Down Load
4
DM3
DI
-
-
-
for Down Load
5
SYRI
DO
Active
-
Active
-
6
VSSO
A
-
-
-
-
7
XTAL
A
-
-
-
X´tal
8
LOAD
A
-
-
-
X´tal
9
VDDREG
DO
-
-
-
-
10
RXDSG
DO
Active
-
Active
-
11
VDDTXDA
DI
-
-
-
12
TXDA
A
Active
-
Active
-
13
VDD
-
-
-
-
-
14
VSS
-
-
-
-
-
15
(NO USE)
DO
-
-
-
-
16
DAON
DO
PA-ON
-
PA-OFF
-
17
SYCL
D0
Active
-
Active
-
18
SYEN
DO
Normal
-
Latch
-
19
SYDA
DI
Active
-
Active
-
20
RXDA
A
Active
-
Active
-
21
RXDB
A
-
-
-
-
22
ANT1
DO
ANT1 ON
-
ANT1 OFF
-
23
VDD
-
-
-
-
-
24
VSS
-
-
-
-
-
25
ANT2
DO
ANT2 ON
-
ANT2 OFF
-
26
I2CLK
DO
Active
-
Active
-
27
I2DAT
DI/O
Data
-
Data
-
28
VSS
-
-
-
-
-
29
CSROQ
DO
-
-
Read IC7
for Flash Memory
30
BSCL0
DO
-
-
-
for Flash Memory
31
BSCL1
DO
-
-
-
for Flash Memory
32
A0
DO
-
-
-
for Flash Memory
33
A1
DO
-
-
-
for Flash Memory
34
VDD
-
-
-
-
-
35
VSS
-
-
-
-
-
36
A2
DO
-
-
-
for Flash Memory
37
A3
DO
-
-
-
for Flash Memory
38
A4
DO
-
-
-
for Flash Memory
39
A5
DO
-
-
-
for Flash Memory
40
A6
DO
-
-
-
for Flash Memory
41
A7
DO
-
-
-
for Flash Memory
42
A8
DO
-
-
-
for Flash Memory
43
A9
DO
-
-
-
for Flash Memory
44
A10
DO
-
-
-
for Flash Memory
45
VSS
-
-
-
-
-
46
VDD
-
-
-
-
-
47
A11
DO
-
-
-
for Flash Memory
48
A12
DO
-
-
-
for Flash Memory
49
A13
DO
-
-
-
for Flash Memory
50
A14
DO
-
-
-
for Flash Memory
51
A15
DO
-
-
-
for Flash Memory
52
D0
DO/I
-
-
-
for Flash Memory
53
D1
DO/I
-
-
-
for Flash Memory
54
D2
DO/I
-
-
-
for Flash Memory
55
VDD
-
-
-
-
-
56
VSS
-
-
-
-
-
57
D3
DO/I
-
-
-
for Flash Memory
58
D4
DO/I
-
-
-
for Flash Memory
59
D5
DO/I
-
-
-
for Flash Memory
60
D6
DO/I
-
-
-
for Flash Memory
61
D7
DI/O
-
-
-
for Flash Memory
62
P0.7
DO
-
-
-
-
62
KX-TCD420RUT / KX-A142RUT
Pin
Descriptiojn
I/O
Hi
Hi-z
Low
Remarks
63
P0.6
DO
Make
Break
-
64
(NO USE)
DO
-
-
-
-
65
(NO USE)
DO
-
-
-
-
66
VDD
-
-
-
-
-
67
VSS
-
-
-
-
-
68
P0.3
DO
-
-
-
-
69
PULSE_CTRL
DO
Q7_ON
-
Q7_OFF
-
70
P0.1
DO
-
-
-
for Flash Memory
71
P0.0
DO
No Key
-
Key
for Key
72
PX.2
DO
-
-
Write IC4
for Flash Memory
73
PX.1
DO
-
-
Read IC4
for Flash Memory
74
(NO USE)
DO
-
-
-
-
75
(NO USE)
DO
-
-
-
-
76
R1
DO
LED ON
-
LED OFF
-
77
(NO USE)
DO
-
-
-
-
78
VDD
-
-
-
-
-
79
VSS
-
-
-
-
-
80
(NO USE)
DO
-
-
-
-
81
TONE
DI
-
-
-
Ring Det
82
(NO USE)
DO
-
-
-
-
83
(NO USE)
DO
-
-
-
-
84
(NO USE)
DO
-
-
-
-
85
(NO USE)
DO
-
-
-
-
86
(NO USE)
DO
-
-
-
-
87
(NO USE)
DO
-
-
-
-
88
VDD
-
-
-
-
-
89
VSS
-
-
-
-
-
90
(NO USE)
DO
-
-
-
-
91
(NO USE)
DO
-
-
-
-
92
(NO USE)
DO
-
-
-
-
93
(NO USE)
DO
-
-
-
-
94
(NO USE)
DO
-
-
-
-
95
MA5
DO/I
-
-
-
for Voice Down Load
96
(NO USE)
DO
-
-
-
-
97
MA3
DO/I
-
-
-
for Voice Down Load
98
VDD
-
-
-
-
-
99
VSS
-
-
-
-
-
100
MA2
DO/I
-
-
-
for Voice Down Load
101
MA1
DO/I
-
-
-
for Voice Down Load
102
MA0
DO/I
-
-
-
for Voice Down Load
103
FRDY
DO
-
-
-
for Flash Memory
104
MD4
DO
-
-
-
for Flash Memory
105
MD2
DO
-
-
-
for Flash Memory
106
MD1
DI
-
-
-
for Flash Memory
107
MD0
DO
-
-
-
for Flash Memory
108
VDD
-
-
-
-
-
109
VSS
-
-
-
-
-
110
(NO USE)
A
-
-
-
-
111
(NO USE)
A
-
-
-
-
112
(NO USE)
A
-
-
-
-
113
(NO USE)
A
-
-
-
-
114
(NO USE)
A
-
-
-
-
115
(NO USE)
A
-
-
-
-
116
VSSA
-
-
-
-
-
117
VDDA
-
-
-
-
-
118
(NO USE)
A
-
-
-
-
119
(NO USE)
AI
-
-
-
-
120
(NO USE)
AI
-
-
-
-
121
(NO USE)
A
-
-
-
-
122
(NO USE)
A
-
-
-
-
123
SON
A
-
-
-
-
124
(NO USE)
A
-
-
-
-
125
(NO USE)
A
-
-
-
-
126
HOP
A
-
-
-
-
127
HOPI
A
-
-
-
-
128
(NO USE)
A
-
-
-
-
129
REFVH
A
-
-
-
-
63
KX-TCD420RUT / KX-A142RUT
Pin
Descriptiojn
I/O
Hi
Hi-z
Low
Remarks
130
BREF
A
-
-
-
-
131
VSSA
-
-
-
-
-
132
VDDA
-
-
-
-
-
133
MIP
A
-
-
-
-
134
MFBN
A
-
-
-
-
135
MFBP
A
-
-
-
-
136
MIN
A
-
-
-
-
137
ADREFP
A
-
-
-
-
138
ADREFN
A
-
-
-
-
139
RSSI
A
-
-
-
-
140
AD3
A
-
-
-
-
141
AD4
A
-
-
-
-
142
MPCINP
A
-
-
-
-
143
RESETQ
A
Normal
-
Reset
-
144
VDD
-
-
-
-
-
Note:
I_PU; Internal Pull-Up, I_PD; Internal Pull-Down
64
KX-TCD420RUT / KX-A142RUT
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