Sharp ER-A750, Service Manual

Page: 42 / 105

No. Pin No. Pin name I/O Pin ER-A750 Description
54 28 TRQ1- O 3S TRQ1 TIMER IRQ signal (RS-232)
55 29 TRQ2- O 3S NC TIMER IRQ signal (INLINE)
56 11 D0 I/O IOU D0 DATA BUS (MAIN)
57 12 D1 I/O IOU D1
58 13 D2 I/O IOU D2
59 14 D3 I/O IOU D3
60 16 D4 I/O IOU D4
61 17 D5 I/O IOU D5
62 18 D6 I/O IOU D6
63 19 D7 I/O IOU D7
64 61 DB0 I/O IOU DB0 DATA BUS (USART)
65 62 DB1 I/O IOU DB1
66 63 DB2 I/O IOU DB2
67 64 DB3 I/O IOU DB3
68 66 DB4 I/O IOU DB4
69 67 DB5 I/O IOU DB5
70 68 DB6 I/O IOU DB6
71 69 DB7 I/O IOU DB7
72 21 A0 I I A0 ADDRESS BUS (MAIN)
73 22 A1 I I A1
74 23 A2 I I A2
75 24 A3 I I A3
76 25 A4 I I A4
77 26 A5 I I A5
78 10 OPTCS- I I OPTCS- OPTION CHIP SELECT (from MPCA7)
79 31 RDO- I I RDO- READ signal (from MPCA7)
80 30 WRO- I I WRO- WRITE signal (from MPCA7)
81 9 RES- I IS RES- RESET signal (from MAIN)
82 34 R- O O RDH READ signal (To USART)
83 37 W- O O WRH WRITE signal (To USART)
84 51 RES O O RES USART RESET signal (To USART)
85 92 X1 O NC cillation circuit
86 91 X2 I #
87 53 XOUT O O CLK USART Clock for USART
88 8 TRCK O O NC T/R clock for 1CH USART
89 35 AB0 O O AH0 Address bus for USART
90 33 AB1 O O AH1
91 85 USICH I ISC GND UNIT3 USART 1CH/2CH select
92 50 PX O NC Power source clock
93 39 VCC +5V
94 89 VCC +5V
95 15 GND GND
96 40 GND GND
97 65 GND GND
98 90 GND GND
99 49 RTS0- O O RTS1- RS-232 control signal RTS- output
100 44 RTS1- O O RTS2-
ICU : CMOS level input (internal pullup resistor)
O
: Output
IS : TTL level input (internal schmit circuit)
ISC : CMOS level input (internal schmit circuit)
3S
: Three state output
IOU : I/O port (internal pullup resistor)
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