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
7 – 10
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