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YM6604 (XH497A00) ACIA (Asynchronous Communication Interface Adapter)
PIN
NAME
I/O
NO.
1
/RESET
I
Reset
2
3
/CS
I
Chip select
4
5
/AS
I
Address strobe
6
7
/LDS
I
Data strobe
8
9
A1
I
10
11
A2
I
12
13
A3
I
Address bus
14
15
A4
I
16
17
A5
I
18
19
Vss
Ground
20
21
CLK
I
System clock
22
23
R/W
I
Read/write control
24
25
/DTACK
O
Data acknowledge
26
Vss
Ground
27
D0
I/O
28
29
D1
I/O
30
Data bus
31
D2
I/O
32
33
D3
I/O
34
Vss
Ground
35
D4
I/O
36
37
D5
I/O
38
Data bus
39
D6
I/O
40
41
D7
I/O
42
Vss
Ground
43
FC0
I
44
45
FC1
I
Function code
46
47
FC2
I
48
49
/IACK
O
Interrupt acknowledge
50
51
Vcc
Power supply
52
53
MODE
I
CPU mode select (When Hi:68000
54
mode, when Lo:6800 mode)
55
/IPL0
O
56
57
/IPL1
O
Interrupt control
58
59
/IPL2
O
60
61
/IRQ1
I
Interrupt request
62
63
/IRQ2
I
Interrupt request
64
FUNCTION
PIN
NAME
I/O
NO.
65
/IRQ3
I
66
67
/IRQ4
I
68
69
/IRQ5
I
Interrupt request
70
71
/IRQ6
I
72
73
/IRQ7
I
74
75
TXD1
O
Data transmission 1
76
77
RXD1
I
Data reception 1
78
79
/RTS1
O
Request to send 1
80
81
/CST1
I
Clear to send 1
82
83
/DCD1
I
Data carrier detect 1
84
85
Vss
Ground
86
87
TXD2
O
Data transmission 2
88
89
RXD2
I
Data reception 2
90
91
/RTS2
O
Request to send 2
92
93
/CTS2
I
Clear to send 2
94
95
/DCD2
I
Data carrier detect 2
96
97
TXD3
O
Data transmission 3
98
99
RXD3
I
Data reception 3
100
101
/RTS3
O
Request to send 3
102
103
/CTS3
I
Clear to send 3
104
105
TXD4
O
Data transmission 4
106
107
RXD4
I
Data reception 4
108
109
/RTS4
O
Request to send 4
110
111
/CTS4
I
Clear to send 4
112
113
Vcc
Power supply
114
115
TXD5
O
Data transmission 5
116
117
RXD5
I
Data reception 5
118
119
TXD6
O
Data transmission 6
120
121
RXD6
I
Data reception 6
122
Vss
Ground
123
FS
I
Counter clock
124
125
XCLK2
I
Clock
126
127
XCLK1
I
Clock
128
D24
MAIN: IC117
FUNCTION
24
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