FP520 Service Manual
Page 12 of 64
4
EPDT
I/O
EEPROM data input/ output
5
EPCK
O
EEPROM clock
6
BYTE
I
Gnd
7
CNVSS
I
Gnd
8
BSHIFT
O
clock beat frequency control
9
SV
O
Min. volume control
10
RESET
I
CPU reset input
11
XOUT
O
CPU clock output
12
VSS
-
Gnd
13
XIN
I
CPU clock input
14
VCC
-
+5V
15
NC
I
+5V
16
PTT
I
PTT control pin input
17
EXT-PTT
I
External PTT control pin input
18
ENC_0
I
channel switch control pin input
19
ENC_1
I
channel switch control pin input
20
ENC_2
I
channel switch control pin input
21
ENC_3
I
channel switch control pin input
22
S_CS
I
data input pin
（
connects 3252
）
23
S_SO
I
data input pin
（
connects 3252
）
24
NC
O
NC
25
S_SCK
O
data input pin
（
connects 3252
）
26
PC/TV
O
tuned voltage output pin
27
S_SI
I
3M
28
3M
O
3M
29
TXD
O
TXD1 output
30
RXD
I
RXD1 input
31
C_CLK
O
JTAG test point
32
C_BUSY
O
JTAG test point
33
NC
-
NC
34
NC
-
NC
35
AFCO_1
O
RX control output pin
36
AFCO_2
O
RX control output pin
37
RX SW
O
Receiver VCO switch
38
TX SW
O
Transmitter VCO switch
39
C_EPN
I
JTAG test point
40
DT
I
PLL data pin
41
LE
O
PLL chip select pin
42
CK
O
PLL clock pin
43
UL
O
PLL losing lock detection pin
44
C_CE
I
JTAG test point
45
SCT3252MOD
O
data output pin
（
connects 3252
）
46
GREEN_LED
I
green light control switch
Summary of Contents for FP520
Page 1: ... 键入文档副标题 gh 选取日期 在此处键入文档的摘要 摘要通常是对文档内容的简短总结 在此处键入文档的摘要 摘要 通常是对文档内容的简短总结 ...
Page 44: ...FP520 Service Manual Page 43 of 64 Figure 1 FP520 01 Mainboard Schematic Diagram 136 174MHz ...
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Page 54: ...FP520 Service Manual Page 53 of 64 Figure 4 FP520 02 Mainboard Schematic Diagram 400 470MHz ...
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Page 64: ...FP520 Service Manual Page 63 of 64 Figure 7 KBC 51 7 4V Electrical Schematic Diagram ...
