Sharp UP-3301 Service Manual page 45

2) Block diagram
DATA BUS
OPC1~USART
USART
Common input
3) Pin descriptions
Pin
Name UP-3301
NO.
1 SL00 VCC
2 SL01 GND
3 SL02 GND
4 SL10 GND
5 SL11 VCC
6 SL12 GND
7 SL20 VCC
8 SL21 VCC
9 SL22 VCC
10 SL30 GND
11 SL31 GND
12 SL32 GND
13 /CD0 /DCD1
14 BRK0 BRK1
15 TRNEMP0 TRENMP1
16 RCVRDY0 RCVRDY1
17 TRNRDY0 TRNRDY1
18 /CTS0 /CTS1
19 RCVDT0 RCVDT1
20 VCC VCC
21 GND GND
BAUD RATE GENERATOR
USART USART
A
I/O Description
ISU RS-232/UNIT0
channel select
ISU
ISU
ISU RS-232/UNIT1
channel select
ISU
ISU
ISU RS-232/UNIT2
channel select
ISU
ISU
ISU RS-232/UNIT3
channel select
ISU
ISU
IS RS-232 control signal
/CD input
IS RS-232 break signal
IS RS-232 transmission
buffer empty signal
IS RS-232 data
reception enable signal
IS RS-232 transmission
enable signal
IS RS-232 clear to send signal
IS RS-232 reception data
signal
+5V
GND
UP-3301US CIRCUIT DESCRIPTION
OPC2
OPC1
BAUD RATE GENERATOR
USART
B
C
Pin
Name UP-3301
NO.
22 /CI0 /CI1
23 /RTS0 /RTS1
24 /CS0 /CS1
25 /CD1 /DCD2
26 BRK1 BRK2
27 TRNEMP1 TRENMP2
28 RCVRDY1 RCVRDY2
29 TRNRDY1 TRNRDY2
30 /CTS1 /CTS2
31 RCVDT1 RCVDT2
32 /CI1 /CI2
33 /RTS1 /RTS2
34 /CS1 /CS2
35 /CD2 VCC
36 TRNEMP2 TRENMP3
37 RCVRDY2 RCVRDY3
38 TRNRDY2 TRNRDY3
– 43 –
USART
D
I/O Description
IS RS-232 control signal
/CI input
O RS-232 request to send
signal
O RS-232 chip select signal
IS RS-232 control signal
/CD input
IS RS-232 break signal
IS RS-232 transmission
buffer empty signal
IS RS-232 data reception
enable signal
IS RS-232 transmission enable
signal
IS RS-232 clear to send signal
IS RS-232 reception data
signal
IS RS-232 control signal /CI
input
O RS-232 request to send
signal
O RS-232 chip select signal
IS +5V
IS RS-232 transmission buffer
empty signal
IS RS-232 data reception
enable signal
IS RS-232 transmission enable
signal