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DR- R504X
• Pin Function
No.
Pin Name
1/0
Function
(
1
vcc
-
2
RA15
0
3
RA14
0
.
4
RA13
0
5
RA12
0
6
RA11
0
RAM address output.
7
RA10
0
8
RA9
0
9
RAB
0
10 GND
-
Ground.
11
RA7
0
12 RA6
0
13 RA5
0
14 RA4
0
15 RA3
0
RAM address output.
.
16 RA2
0
17
RA1
0
18 RAO
0
19 GND
-
Ground.
20
RD7
1/0
21
RD6
1/0
22
RD5
1/0
(
23
RD4
1/0
RD3
1/0
RAM data input/output.
24
25 RD2
1/0
26 RD1
1/0
27
ADO
1/0
28
RWE
0
RAM write enanble.
29
ROE
0
RAM output
enanble.
30
vcc
-
Power supply
voltage.
(
31
RCS
0
RAM chip select output.
32 SYDO
1/0
33 SYD1
1/0
34 SYD2
1/0
35 SYD3
1/0
36 SYD4
1/0
System control data bus.
37 SYD5
1/0
38 SYD6
1/0
39 SYD7
1/0
40 GND
-
Ground.
41
SYAO
I
42 SYA1
I
43 SYA2
I
System control address
bus.
-
(
44 SYA3
I
45 SYA4
I
56
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