Sharp ER-A450T Service Manual page 23

Pin
Name ER-A770
NO.
54 D2 D2
55 D3 D3
56 GND GND
57 D4 D4
58 D5 D5
59 D6 D6
60 D7 D7
61 GND GND
62 VCC VCC
63 X1 NC
64 X2 #
65 XOUT CLK_USART
66 TRCK NC
67 AB0 AH0
68 AB1 AH1
69 US1CH GND
70 PX NC
71 /POF /POFF
72 /RSRQ /IRQ1
73 /TRV GND
74 RXDATA0 NC
75 TXE /SRESET
76 /TRRQ /TRQ2
77 /TRQ1 /TRQ1
78 /TRQ2 NC
79 A0 A0
80 A1 A1
81 A2 A2
82 A3 A3
83 A4 A4
84 A5 A5
85 /OPTCS /OPTCS
86 /RD /RDO
87 /WR /WRO
88 /RES /RES
89 DB0 DB0
90 DB1 DB1
91 DB2 DB2
92 DB3 DB3
93 GND GND
94 DB4 DB4
95 DB5 DB5
96 DB6 DB6
97 DB7 DB7
98 /R /RDH
I/O Description
IO Data bus (CPU)
IO Data bus (CPU)
GND
IO Data bus (CPU)
IO Data bus (CPU)
IO Data bus (CPU)
IO Data bus (CPU)
GND
+5V
O OSI14 NC
I OSI14 System clock
O Clock (USART)
O NC
Address bus for
O
USART
Address bus for
O
USART
IS GND
O NC
IS POFF signal
3S RS232 INTRRUPT
IS GND
O NC
INLINE SOFT
O
RESET
3S INLINE INTRRUPT
TIMER INTRRUPT
ON6
(RS232)
TIMER INTRRUPT
ON6
(INLINE)
I Address bus for CPU
I Address bus for CPU
I Address bus for CPU
I Address bus for CPU
I Address bus for CPU
I Address bus for CPU
Option chip select
I
(from MPCA)
Read signal
I
(from CPU)
Write signal
I
(from CPU)
Reset signal
IS
(from CPU)
IO DATA BUS (USART)
IO DATA BUS (USART)
IO DATA BUS (USART)
IO DATA BUS (USART)
GND
IO DATA BUS (USART)
IO DATA BUS (USART)
IO DATA BUS (USART)
IO DATA BUS (USART)
Read signal
O
(to USART)
Pin
Name ER-A770
NO.
99 /W
100 VCC
101 GND
102 RES RES USART
103 TRNCLK
104 RCVCLK
105 DBTST
106 UTST
107 /CSA
108 TRNDTA
109 /DTRA
110 /RTSA
111 RCVDTA RCVDT1
112 /CTSA
113 /DSRA
114 TRNRDYA TRNRDY1
115 RCVRDYA RCVRDY1
116 TRNEMPA TRNEMP1
117 SYCBKA
118 GND
119 /CSB
120 TRNDTB
121 /DTRB
122 /RTSB
123 RCVDTB RCVDT2
124 /CTSB
125 /DSRB
126 TRNRDYB TRNRDY2
127 RCVRDYB RCVRDY2
128 TRNEMPB TRNEMP2
129 SYCBKB
130 GND
131 /CSC
132 TRNDTC
133 /DTRC
134 /RTSC
135 RCVDTC RCVDT3
136 /CTSC
137 /DSRC
138 TRNRDYC TRNRDY3
139 RCVRDYC RCVRDY3
140 TRNEMPC TRNEMP3
141 SYCBKC
4 – 15
I/O Description
Write signal
/WRH O
(to USART)
VCC +5V
GND GND
Reset signal
O
(to USART)
GND I GND
GND I GND
RS-232/INLINE
/SRCS ID
USART chip select
VCC ID +5V
/CS1 IS USART_A chip select
RS-232 transmission
TXD1 O
data signal
RS-232 data
/DTR1 O
terminal ready signal
NC O NC
RS-232 reception
IS
data signal
GND IS GND
RS-232 data set
/DSR1 IS
ready signal
RS-232 data
O transmission enable
signal
RS-232 data reception
O
enable signal
RS-232 transmission
O
buffer empty signal
Break code
BRK1 IO
detection signal
GND GND
/CS2 IS USART_B chip select
TXD2 O NC
/DTR2 O NC
NC O NC
IS GND
GND IS GND
/DSR2 IS GND
O NC
O NC
O NC
BRK2 IO NC
GND GND
USART_C chip
/CS3 IS
select
TXD3 O NC
/DTR3 O NC
/RTS3 O NC
IS GND
GND IS GND
/DSR3 IS GND
O NC
O NC
O NC
NC IO NC