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2) Block diagram
3) Pin description
USART
A
USART
B
USART
C
USART
D
USART
OPC1
DATA BUS
OPC1~USART
OPC2
Common input
BAUD RATE GENERATOR
BAUD RATE GENERATOR
Pin
NO.
Name
UP-3300
I/O
Description
1
SL00
VCC
ISU
RS-232/UNIT0
channel select
2
SL01
GND
ISU
3
SL02
GND
ISU
4
SL10
GND
ISU
RS-232/UNIT1
channel select
5
SL11
VCC
ISU
6
SL12
GND
ISU
7
SL20
VCC
ISU
RS-232/UNIT2
channel select
8
SL21
VCC
ISU
9
SL22
VCC
ISU
10
SL30
GND
ISU
RS-232/UNIT3
channel select
11
SL31
GND
ISU
12
SL32
GND
ISU
13
/CD0
/DCD1
IS
RS-232 control signal
/CD input
14
BRK0
BRK1
IS
RS-232 break signal
15
TRNEMP0
TRENMP1
IS
RS-232 transmission
buffer empty signal
16
RCVRDY0
RCVRDY1
IS
RS-232 data
reception enable
signal
17
TRNRDY0
TRNRDY1
IS
RS-232 transmission
enable signal
18
/CTS0
/CTS1
IS
RS-232 clear to send
signal
19
RCVDT0
RCVDT1
IS
RS-232 reception
data signal
20
VCC
VCC
+5V
21
GND
GND
GND
22
/CI0
/CI1
IS
RS-232 control signal
/CI input
23
/RTS0
/RTS1
O
RS-232 request to
send signal
Pin
NO.
Name
UP-3300
I/O
Description
24
/CS0
/CS1
O
RS-232 chip select
signal
25
/CD1
/DCD2
IS
RS-232 control signal
/CD input
26
BRK1
BRK2
IS
RS-232 break signal
27
TRNEMP1
TRENMP2
IS
RS-232 transmission
buffer empty signal
28
RCVRDY1
RCVRDY2
IS
RS-232 data
reception enable
signal
29
TRNRDY1
TRNRDY2
IS
RS-232 transmission
enable signal
30
/CTS1
/CTS2
IS
RS-232 clear to send
signal
31
RCVDT1
RCVDT2
IS
RS-232 reception
data signal
32
/CI1
/CI2
IS
RS-232 control signal
/CI input
33
/RTS1
/RTS2
O
RS-232 request to
send signal
34
/CS1
/CS2
O
RS-232 chip select
signal
35
/CD2
VCC
IS
+5V
36
TRNEMP2
TRENMP3
IS
RS-232 transmission
buffer empty signal
37
RCVRDY2
RCVRDY3
IS
RS-232 data
reception enable
signal
38
TRNRDY2
TRNRDY3
IS
RS-232 transmission
enable signal
39
CTS2Z
/CTS3
IS
RS-232 clear to send
signal
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