Fujitsu FR81S User Manual
CHAPTER 36: EXTERNAL BUS INTERFACE
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : EXTERNAL BUS INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
20
5.1. External Pin Table
This section shows the external pin table.
This section shows the external pins for the external bus interface of this series.
Table 5-1 External pin table
External
pin of this
series
Pin number of
this series
Description
64pin
80pin 100pin 120pin 144pin 176pin
SYSCLK
-
-
-
-
35
43
System clock output
ASX
-
-
-
-
5
7
Address strobe output
CS0X
-
-
-
-
6
8
Chip selected output
CS1X
-
-
-
-
7
9
CS2X
-
-
-
-
38
46
CS3X
-
-
-
-
39
49
RDX
-
-
-
-
8
10
Read strobe output
WR0X
-
-
-
-
9
11
Write strobe output
WR1X
-
-
-
-
10
12
RDY
-
-
-
-
41
51
Bus ready input
D16
-
-
-
-
131
159
Data input/output and address
output
(during address multiplexing)
D17
-
-
-
-
132
160
D18
-
-
-
-
133
161
D19
-
-
-
-
134
162
D20
-
-
-
-
135
163
D21
-
-
-
-
136
165
D22
-
-
-
-
137
167
D23
-
-
-
-
138
168
D24
-
-
-
-
139
170
D25
-
-
-
-
140
171
D26
-
-
-
-
141
172
D27
-
-
-
-
142
174
D28
-
-
-
-
143
175
D29
-
-
-
-
2
2
D30
-
-
-
-
3
3
D31
-
-
-
-
4
5
MB91520 Series
MN705-00010-1v0-E
1219